Finding the Fourth Proportional to 12,810.52, 17,689.02 and 12,158.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,810.52 : 17,689.02 = 12,158.20 : x
2. Step 2: Convert to fraction form
   12,810.52/17,689.02 = 12,158.20/x
3. Step 3: Cross multiply
   12,810.52x = 17,689.02 × 12,158.20
4. Step 4: Simplify right side
   12,810.52x = 215,066,642.96
5. Step 5: Solve for x
   x = 215,066,642.96/12,810.52
6. Step 6: Final answer
   x = 16,788.28