Finding the Fourth Proportional to 12,521.66, 17,277.42 and 7,143.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,521.66 : 17,277.42 = 7,143.98 : x
2. Step 2: Convert to fraction form
   12,521.66/17,277.42 = 7,143.98/x
3. Step 3: Cross multiply
   12,521.66x = 17,277.42 × 7,143.98
4. Step 4: Simplify right side
   12,521.66x = 123,429,542.93
5. Step 5: Solve for x
   x = 123,429,542.93/12,521.66
6. Step 6: Final answer
   x = 9,857.28