Finding the Fourth Proportional to 12,499.02, 17,247.96 and 7,121.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,499.02 : 17,247.96 = 7,121.43 : x
2. Step 2: Convert to fraction form
   12,499.02/17,247.96 = 7,121.43/x
3. Step 3: Cross multiply
   12,499.02x = 17,247.96 × 7,121.43
4. Step 4: Simplify right side
   12,499.02x = 122,830,139.78
5. Step 5: Solve for x
   x = 122,830,139.78/12,499.02
6. Step 6: Final answer
   x = 9,827.18