Finding the Fourth Proportional to 12,420.02, 17,140.02 and 7,116.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,420.02 : 17,140.02 = 7,116.50 : x
2. Step 2: Convert to fraction form
   12,420.02/17,140.02 = 7,116.50/x
3. Step 3: Cross multiply
   12,420.02x = 17,140.02 × 7,116.50
4. Step 4: Simplify right side
   12,420.02x = 121,976,952.33
5. Step 5: Solve for x
   x = 121,976,952.33/12,420.02
6. Step 6: Final answer
   x = 9,820.99