Finding the Fourth Proportional to 156,742.82, 216,303.04 and 85,123.30

Step by Step Solution

1. Step 1: Write the proportion equation
   156,742.82 : 216,303.04 = 85,123.30 : x
2. Step 2: Convert to fraction form
   156,742.82/216,303.04 = 85,123.30/x
3. Step 3: Cross multiply
   156,742.82x = 216,303.04 × 85,123.30
4. Step 4: Simplify right side
   156,742.82x = 18,412,428,564.83
5. Step 5: Solve for x
   x = 18,412,428,564.83/156,742.82
6. Step 6: Final answer
   x = 117,469.04