Finding the Fourth Proportional to 12,426.48, 17,146.55 and 7,120.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,426.48 : 17,146.55 = 7,120.31 : x
2. Step 2: Convert to fraction form
   12,426.48/17,146.55 = 7,120.31/x
3. Step 3: Cross multiply
   12,426.48x = 17,146.55 × 7,120.31
4. Step 4: Simplify right side
   12,426.48x = 122,088,683.50
5. Step 5: Solve for x
   x = 122,088,683.50/12,426.48
6. Step 6: Final answer
   x = 9,824.88