Finding the Fourth Proportional to 156,640.84, 216,158.56 and 85,019.32

Step by Step Solution

1. Step 1: Write the proportion equation
   156,640.84 : 216,158.56 = 85,019.32 : x
2. Step 2: Convert to fraction form
   156,640.84/216,158.56 = 85,019.32/x
3. Step 3: Cross multiply
   156,640.84x = 216,158.56 × 85,019.32
4. Step 4: Simplify right side
   156,640.84x = 18,377,653,841.03
5. Step 5: Solve for x
   x = 18,377,653,841.03/156,640.84
6. Step 6: Final answer
   x = 117,323.52