Finding the Fourth Proportional to 12,521.31, 17,279.43 and 7,216.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,521.31 : 17,279.43 = 7,216.17 : x
2. Step 2: Convert to fraction form
   12,521.31/17,279.43 = 7,216.17/x
3. Step 3: Cross multiply
   12,521.31x = 17,279.43 × 7,216.17
4. Step 4: Simplify right side
   12,521.31x = 124,691,304.38
5. Step 5: Solve for x
   x = 124,691,304.38/12,521.31
6. Step 6: Final answer
   x = 9,958.33