Finding the Fourth Proportional to 12,495.89, 17,215.05 and 8,712.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,495.89 : 17,215.05 = 8,712.18 : x
2. Step 2: Convert to fraction form
   12,495.89/17,215.05 = 8,712.18/x
3. Step 3: Cross multiply
   12,495.89x = 17,215.05 × 8,712.18
4. Step 4: Simplify right side
   12,495.89x = 149,980,614.31
5. Step 5: Solve for x
   x = 149,980,614.31/12,495.89
6. Step 6: Final answer
   x = 12,002.40