Finding the Fourth Proportional to 9,153.92, 12,642.72 and 7,083.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,153.92 : 12,642.72 = 7,083.20 : x
2. Step 2: Convert to fraction form
   9,153.92/12,642.72 = 7,083.20/x
3. Step 3: Cross multiply
   9,153.92x = 12,642.72 × 7,083.20
4. Step 4: Simplify right side
   9,153.92x = 89,550,914.30
5. Step 5: Solve for x
   x = 89,550,914.30/9,153.92
6. Step 6: Final answer
   x = 9,782.79