Finding the Fourth Proportional to 9,172.04, 12,657.72 and 5,139.03

Step by Step Solution

1. Step 1: Write the proportion equation
   9,172.04 : 12,657.72 = 5,139.03 : x
2. Step 2: Convert to fraction form
   9,172.04/12,657.72 = 5,139.03/x
3. Step 3: Cross multiply
   9,172.04x = 12,657.72 × 5,139.03
4. Step 4: Simplify right side
   9,172.04x = 65,048,402.81
5. Step 5: Solve for x
   x = 65,048,402.81/9,172.04
6. Step 6: Final answer
   x = 7,092.04