Finding the Fourth Proportional to 8,770.86, 12,111.66 and 8,158.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,770.86 : 12,111.66 = 8,158.50 : x
2. Step 2: Convert to fraction form
   8,770.86/12,111.66 = 8,158.50/x
3. Step 3: Cross multiply
   8,770.86x = 12,111.66 × 8,158.50
4. Step 4: Simplify right side
   8,770.86x = 98,812,978.11
5. Step 5: Solve for x
   x = 98,812,978.11/8,770.86
6. Step 6: Final answer
   x = 11,266.05