Finding the Fourth Proportional to 426,353.61, 639,443.94 and 156,389.86

Step by Step Solution

1. Step 1: Write the proportion equation
   426,353.61 : 639,443.94 = 156,389.86 : x
2. Step 2: Convert to fraction form
   426,353.61/639,443.94 = 156,389.86/x
3. Step 3: Cross multiply
   426,353.61x = 639,443.94 × 156,389.86
4. Step 4: Simplify right side
   426,353.61x = 100,002,551,585.27
5. Step 5: Solve for x
   x = 100,002,551,585.27/426,353.61
6. Step 6: Final answer
   x = 234,553.08