Finding the Fourth Proportional to 123,399.72, 170,290.89 and 69,702.12

Step by Step Solution

1. Step 1: Write the proportion equation
   123,399.72 : 170,290.89 = 69,702.12 : x
2. Step 2: Convert to fraction form
   123,399.72/170,290.89 = 69,702.12/x
3. Step 3: Cross multiply
   123,399.72x = 170,290.89 × 69,702.12
4. Step 4: Simplify right side
   123,399.72x = 11,869,636,049.69
5. Step 5: Solve for x
   x = 11,869,636,049.69/123,399.72
6. Step 6: Final answer
   x = 96,188.52