Finding the Fourth Proportional to 123,500.45, 170,439.17 and 75,121.29

Step by Step Solution

1. Step 1: Write the proportion equation
   123,500.45 : 170,439.17 = 75,121.29 : x
2. Step 2: Convert to fraction form
   123,500.45/170,439.17 = 75,121.29/x
3. Step 3: Cross multiply
   123,500.45x = 170,439.17 × 75,121.29
4. Step 4: Simplify right side
   123,500.45x = 12,803,609,941.32
5. Step 5: Solve for x
   x = 12,803,609,941.32/123,500.45
6. Step 6: Final answer
   x = 103,672.58