Finding the Fourth Proportional to 12,726.79, 17,563.50 and 8,471.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,726.79 : 17,563.50 = 8,471.05 : x
2. Step 2: Convert to fraction form
   12,726.79/17,563.50 = 8,471.05/x
3. Step 3: Cross multiply
   12,726.79x = 17,563.50 × 8,471.05
4. Step 4: Simplify right side
   12,726.79x = 148,781,242.77
5. Step 5: Solve for x
   x = 148,781,242.77/12,726.79
6. Step 6: Final answer
   x = 11,690.40