Finding the Fourth Proportional to 12,495.52, 17,239.68 and 7,188.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,495.52 : 17,239.68 = 7,188.40 : x
2. Step 2: Convert to fraction form
   12,495.52/17,239.68 = 7,188.40/x
3. Step 3: Cross multiply
   12,495.52x = 17,239.68 × 7,188.40
4. Step 4: Simplify right side
   12,495.52x = 123,925,715.71
5. Step 5: Solve for x
   x = 123,925,715.71/12,495.52
6. Step 6: Final answer
   x = 9,917.61