Finding the Fourth Proportional to 111,585.09, 153,910.98 and 71,280.96

Step by Step Solution

1. Step 1: Write the proportion equation
   111,585.09 : 153,910.98 = 71,280.96 : x
2. Step 2: Convert to fraction form
   111,585.09/153,910.98 = 71,280.96/x
3. Step 3: Cross multiply
   111,585.09x = 153,910.98 × 71,280.96
4. Step 4: Simplify right side
   111,585.09x = 10,970,922,408.94
5. Step 5: Solve for x
   x = 10,970,922,408.94/111,585.09
6. Step 6: Final answer
   x = 98,318.89