Finding the Fourth Proportional to 12,444.56, 17,172.60 and 7,139.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,444.56 : 17,172.60 = 7,139.24 : x
2. Step 2: Convert to fraction form
   12,444.56/17,172.60 = 7,139.24/x
3. Step 3: Cross multiply
   12,444.56x = 17,172.60 × 7,139.24
4. Step 4: Simplify right side
   12,444.56x = 122,599,312.82
5. Step 5: Solve for x
   x = 122,599,312.82/12,444.56
6. Step 6: Final answer
   x = 9,851.64