Finding the Fourth Proportional to 15,111.16, 20,866.01 and 12,606.42

Step by Step Solution

1. Step 1: Write the proportion equation
   15,111.16 : 20,866.01 = 12,606.42 : x
2. Step 2: Convert to fraction form
   15,111.16/20,866.01 = 12,606.42/x
3. Step 3: Cross multiply
   15,111.16x = 20,866.01 × 12,606.42
4. Step 4: Simplify right side
   15,111.16x = 263,045,685.78
5. Step 5: Solve for x
   x = 263,045,685.78/15,111.16
6. Step 6: Final answer
   x = 17,407.38