Finding the Fourth Proportional to 12,422.20, 17,140.72 and 7,386.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,422.20 : 17,140.72 = 7,386.32 : x
2. Step 2: Convert to fraction form
   12,422.20/17,140.72 = 7,386.32/x
3. Step 3: Cross multiply
   12,422.20x = 17,140.72 × 7,386.32
4. Step 4: Simplify right side
   12,422.20x = 126,606,842.95
5. Step 5: Solve for x
   x = 126,606,842.95/12,422.20
6. Step 6: Final answer
   x = 10,191.98