Finding the Fourth Proportional to 12,499.15, 17,250.36 and 7,123.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,499.15 : 17,250.36 = 7,123.57 : x
2. Step 2: Convert to fraction form
   12,499.15/17,250.36 = 7,123.57/x
3. Step 3: Cross multiply
   12,499.15x = 17,250.36 × 7,123.57
4. Step 4: Simplify right side
   12,499.15x = 122,884,146.99
5. Step 5: Solve for x
   x = 122,884,146.99/12,499.15
6. Step 6: Final answer
   x = 9,831.40