Finding the Fourth Proportional to 156,747.82, 216,309.94 and 85,128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   156,747.82 : 216,309.94 = 85,128.30 : x
2. Step 2: Convert to fraction form
   156,747.82/216,309.94 = 85,128.30/x
3. Step 3: Cross multiply
   156,747.82x = 216,309.94 × 85,128.30
4. Step 4: Simplify right side
   156,747.82x = 18,414,097,465.30
5. Step 5: Solve for x
   x = 18,414,097,465.30/156,747.82
6. Step 6: Final answer
   x = 117,475.94