Finding the Fourth Proportional to 123,702.72, 170,710.56 and 69,989.76

Step by Step Solution

1. Step 1: Write the proportion equation
   123,702.72 : 170,710.56 = 69,989.76 : x
2. Step 2: Convert to fraction form
   123,702.72/170,710.56 = 69,989.76/x
3. Step 3: Cross multiply
   123,702.72x = 170,710.56 × 69,989.76
4. Step 4: Simplify right side
   123,702.72x = 11,947,991,123.87
5. Step 5: Solve for x
   x = 11,947,991,123.87/123,702.72
6. Step 6: Final answer
   x = 96,586.33