Finding the Fourth Proportional to 391,373,741.91, 540,096,111.32 and 215,164,735.28

Step by Step Solution

1. Step 1: Write the proportion equation
   391,373,741.91 : 540,096,111.32 = 215,164,735.28 : x
2. Step 2: Convert to fraction form
   391,373,741.91/540,096,111.32 = 215,164,735.28/x
3. Step 3: Cross multiply
   391,373,741.91x = 540,096,111.32 × 215,164,735.28
4. Step 4: Simplify right side
   391,373,741.91x = 116,209,636,814,148,928
5. Step 5: Solve for x
   x = 116,209,636,814,148,928/391,373,741.91
6. Step 6: Final answer
   x = 296,927,525.71