Finding the Fourth Proportional to 398,632.72, 596,727.96 and 258,111.76

Step by Step Solution

1. Step 1: Write the proportion equation
   398,632.72 : 596,727.96 = 258,111.76 : x
2. Step 2: Convert to fraction form
   398,632.72/596,727.96 = 258,111.76/x
3. Step 3: Cross multiply
   398,632.72x = 596,727.96 × 258,111.76
4. Step 4: Simplify right side
   398,632.72x = 154,022,503,996.81
5. Step 5: Solve for x
   x = 154,022,503,996.81/398,632.72
6. Step 6: Final answer
   x = 386,376.97