Finding the Fourth Proportional to 348,978.16, 522,433.88 and 215,429.01

Step by Step Solution

1. Step 1: Write the proportion equation
   348,978.16 : 522,433.88 = 215,429.01 : x
2. Step 2: Convert to fraction form
   348,978.16/522,433.88 = 215,429.01/x
3. Step 3: Cross multiply
   348,978.16x = 522,433.88 × 215,429.01
4. Step 4: Simplify right side
   348,978.16x = 112,547,413,558.86
5. Step 5: Solve for x
   x = 112,547,413,558.86/348,978.16
6. Step 6: Final answer
   x = 322,505.61