Finding the Fourth Proportional to 9,521.34, 13,139.28 and 5,272.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,521.34 : 13,139.28 = 5,272.31 : x
2. Step 2: Convert to fraction form
   9,521.34/13,139.28 = 5,272.31/x
3. Step 3: Cross multiply
   9,521.34x = 13,139.28 × 5,272.31
4. Step 4: Simplify right side
   9,521.34x = 69,274,390.19
5. Step 5: Solve for x
   x = 69,274,390.19/9,521.34
6. Step 6: Final answer
   x = 7,275.70