Finding the Fourth Proportional to 9,039.28, 12,472.44 and 5,680.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,039.28 : 12,472.44 = 5,680.15 : x
2. Step 2: Convert to fraction form
   9,039.28/12,472.44 = 5,680.15/x
3. Step 3: Cross multiply
   9,039.28x = 12,472.44 × 5,680.15
4. Step 4: Simplify right side
   9,039.28x = 70,845,330.07
5. Step 5: Solve for x
   x = 70,845,330.07/9,039.28
6. Step 6: Final answer
   x = 7,837.50