Finding the Fourth Proportional to 12,444.50, 17,173.42 and 7,139.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,444.50 : 17,173.42 = 7,139.10 : x
2. Step 2: Convert to fraction form
   12,444.50/17,173.42 = 7,139.10/x
3. Step 3: Cross multiply
   12,444.50x = 17,173.42 × 7,139.10
4. Step 4: Simplify right side
   12,444.50x = 122,602,762.72
5. Step 5: Solve for x
   x = 122,602,762.72/12,444.50
6. Step 6: Final answer
   x = 9,851.96