Finding the Fourth Proportional to 9,045.30, 12,492.63 and 7,640.83

Step by Step Solution

1. Step 1: Write the proportion equation
   9,045.30 : 12,492.63 = 7,640.83 : x
2. Step 2: Convert to fraction form
   9,045.30/12,492.63 = 7,640.83/x
3. Step 3: Cross multiply
   9,045.30x = 12,492.63 × 7,640.83
4. Step 4: Simplify right side
   9,045.30x = 95,454,077.70
5. Step 5: Solve for x
   x = 95,454,077.70/9,045.30
6. Step 6: Final answer
   x = 10,552.90