Finding the Fourth Proportional to 12,838.52, 17,716.50 and 7,172.13

Step by Step Solution

1. Step 1: Write the proportion equation
   12,838.52 : 17,716.50 = 7,172.13 : x
2. Step 2: Convert to fraction form
   12,838.52/17,716.50 = 7,172.13/x
3. Step 3: Cross multiply
   12,838.52x = 17,716.50 × 7,172.13
4. Step 4: Simplify right side
   12,838.52x = 127,065,041.15
5. Step 5: Solve for x
   x = 127,065,041.15/12,838.52
6. Step 6: Final answer
   x = 9,897.18