Finding the Fourth Proportional to 12,499.18, 17,219.54 and 8,715.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,499.18 : 17,219.54 = 8,715.47 : x
2. Step 2: Convert to fraction form
   12,499.18/17,219.54 = 8,715.47/x
3. Step 3: Cross multiply
   12,499.18x = 17,219.54 × 8,715.47
4. Step 4: Simplify right side
   12,499.18x = 150,076,319.97
5. Step 5: Solve for x
   x = 150,076,319.97/12,499.18
6. Step 6: Final answer
   x = 12,006.90