Finding the Fourth Proportional to 111,585.27, 153,943.16 and 71,288.58

Step by Step Solution

1. Step 1: Write the proportion equation
   111,585.27 : 153,943.16 = 71,288.58 : x
2. Step 2: Convert to fraction form
   111,585.27/153,943.16 = 71,288.58/x
3. Step 3: Cross multiply
   111,585.27x = 153,943.16 × 71,288.58
4. Step 4: Simplify right side
   111,585.27x = 10,974,388,920.67
5. Step 5: Solve for x
   x = 10,974,388,920.67/111,585.27
6. Step 6: Final answer
   x = 98,349.80