Finding the Fourth Proportional to 12,612.84, 18,899.72 and 8,665.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,612.84 : 18,899.72 = 8,665.98 : x
2. Step 2: Convert to fraction form
   12,612.84/18,899.72 = 8,665.98/x
3. Step 3: Cross multiply
   12,612.84x = 18,899.72 × 8,665.98
4. Step 4: Simplify right side
   12,612.84x = 163,784,595.53
5. Step 5: Solve for x
   x = 163,784,595.53/12,612.84
6. Step 6: Final answer
   x = 12,985.54