Finding the Fourth Proportional to 9,521.25, 13,139.25 and 5,272.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,521.25 : 13,139.25 = 5,272.29 : x
2. Step 2: Convert to fraction form
   9,521.25/13,139.25 = 5,272.29/x
3. Step 3: Cross multiply
   9,521.25x = 13,139.25 × 5,272.29
4. Step 4: Simplify right side
   9,521.25x = 69,273,916.61
5. Step 5: Solve for x
   x = 69,273,916.61/9,521.25
6. Step 6: Final answer
   x = 7,275.72