Finding the Fourth Proportional to 12,417.20, 17,139.72 and 7,952.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,417.20 : 17,139.72 = 7,952.98 : x
2. Step 2: Convert to fraction form
   12,417.20/17,139.72 = 7,952.98/x
3. Step 3: Cross multiply
   12,417.20x = 17,139.72 × 7,952.98
4. Step 4: Simplify right side
   12,417.20x = 136,311,850.37
5. Step 5: Solve for x
   x = 136,311,850.37/12,417.20
6. Step 6: Final answer
   x = 10,977.66