Finding the Fourth Proportional to 12,499.34, 17,244.20 and 7,191.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,499.34 : 17,244.20 = 7,191.40 : x
2. Step 2: Convert to fraction form
   12,499.34/17,244.20 = 7,191.40/x
3. Step 3: Cross multiply
   12,499.34x = 17,244.20 × 7,191.40
4. Step 4: Simplify right side
   12,499.34x = 124,009,939.88
5. Step 5: Solve for x
   x = 124,009,939.88/12,499.34
6. Step 6: Final answer
   x = 9,921.32