Finding the Fourth Proportional to 111,116.50, 153,339.60 and 60,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   111,116.50 : 153,339.60 = 60,128.12 : x
2. Step 2: Convert to fraction form
   111,116.50/153,339.60 = 60,128.12/x
3. Step 3: Cross multiply
   111,116.50x = 153,339.60 × 60,128.12
4. Step 4: Simplify right side
   111,116.50x = 9,220,021,869.55
5. Step 5: Solve for x
   x = 9,220,021,869.55/111,116.50
6. Step 6: Final answer
   x = 82,976.17