Finding the Fourth Proportional to 156,640.96, 216,158.73 and 85,019.46

Step by Step Solution

1. Step 1: Write the proportion equation
   156,640.96 : 216,158.73 = 85,019.46 : x
2. Step 2: Convert to fraction form
   156,640.96/216,158.73 = 85,019.46/x
3. Step 3: Cross multiply
   156,640.96x = 216,158.73 × 85,019.46
4. Step 4: Simplify right side
   156,640.96x = 18,377,698,498.89
5. Step 5: Solve for x
   x = 18,377,698,498.89/156,640.96
6. Step 6: Final answer
   x = 117,323.71