Finding the Fourth Proportional to 111,561.50, 153,963.10 and 69,128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   111,561.50 : 153,963.10 = 69,128.30 : x
2. Step 2: Convert to fraction form
   111,561.50/153,963.10 = 69,128.30/x
3. Step 3: Cross multiply
   111,561.50x = 153,963.10 × 69,128.30
4. Step 4: Simplify right side
   111,561.50x = 10,643,207,365.73
5. Step 5: Solve for x
   x = 10,643,207,365.73/111,561.50
6. Step 6: Final answer
   x = 95,402.15