Finding the Fourth Proportional to 156,631.30, 234,428.55 and 121,380.10

Step by Step Solution

1. Step 1: Write the proportion equation
   156,631.30 : 234,428.55 = 121,380.10 : x
2. Step 2: Convert to fraction form
   156,631.30/234,428.55 = 121,380.10/x
3. Step 3: Cross multiply
   156,631.30x = 234,428.55 × 121,380.10
4. Step 4: Simplify right side
   156,631.30x = 28,454,960,841.86
5. Step 5: Solve for x
   x = 28,454,960,841.86/156,631.30
6. Step 6: Final answer
   x = 181,668.42