Finding the Fourth Proportional to 111,128.17, 153,355.69 and 60,139.79

Step by Step Solution

1. Step 1: Write the proportion equation
   111,128.17 : 153,355.69 = 60,139.79 : x
2. Step 2: Convert to fraction form
   111,128.17/153,355.69 = 60,139.79/x
3. Step 3: Cross multiply
   111,128.17x = 153,355.69 × 60,139.79
4. Step 4: Simplify right side
   111,128.17x = 9,222,778,991.91
5. Step 5: Solve for x
   x = 9,222,778,991.91/111,128.17
6. Step 6: Final answer
   x = 82,992.27