Finding the Fourth Proportional to 12,061.56, 16,648.29 and 7,869

Step by Step Solution

1. Step 1: Write the proportion equation
   12,061.56 : 16,648.29 = 7,869 : x
2. Step 2: Convert to fraction form
   12,061.56/16,648.29 = 7,869/x
3. Step 3: Cross multiply
   12,061.56x = 16,648.29 × 7,869
4. Step 4: Simplify right side
   12,061.56x = 131,005,394.01
5. Step 5: Solve for x
   x = 131,005,394.01/12,061.56
6. Step 6: Final answer
   x = 10,861.40