Finding the Fourth Proportional to 12,426.32, 17,148.73 and 7,122.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,426.32 : 17,148.73 = 7,122.15 : x
2. Step 2: Convert to fraction form
   12,426.32/17,148.73 = 7,122.15/x
3. Step 3: Cross multiply
   12,426.32x = 17,148.73 × 7,122.15
4. Step 4: Simplify right side
   12,426.32x = 122,135,791.76
5. Step 5: Solve for x
   x = 122,135,791.76/12,426.32
6. Step 6: Final answer
   x = 9,828.80