Finding the Fourth Proportional to 9,078.72, 12,497.53 and 7,876.63

Step by Step Solution

1. Step 1: Write the proportion equation
   9,078.72 : 12,497.53 = 7,876.63 : x
2. Step 2: Convert to fraction form
   9,078.72/12,497.53 = 7,876.63/x
3. Step 3: Cross multiply
   9,078.72x = 12,497.53 × 7,876.63
4. Step 4: Simplify right side
   9,078.72x = 98,438,317.85
5. Step 5: Solve for x
   x = 98,438,317.85/9,078.72
6. Step 6: Final answer
   x = 10,842.75