Finding the Fourth Proportional to 10,861.94, 16,275.90 and 8,670.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,861.94 : 16,275.90 = 8,670.08 : x
2. Step 2: Convert to fraction form
   10,861.94/16,275.90 = 8,670.08/x
3. Step 3: Cross multiply
   10,861.94x = 16,275.90 × 8,670.08
4. Step 4: Simplify right side
   10,861.94x = 141,113,428.27
5. Step 5: Solve for x
   x = 141,113,428.27/10,861.94
6. Step 6: Final answer
   x = 12,991.55