Finding the Fourth Proportional to 9,360.79, 12,977.03 and 8,861.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,360.79 : 12,977.03 = 8,861.42 : x
2. Step 2: Convert to fraction form
   9,360.79/12,977.03 = 8,861.42/x
3. Step 3: Cross multiply
   9,360.79x = 12,977.03 × 8,861.42
4. Step 4: Simplify right side
   9,360.79x = 114,994,967.78
5. Step 5: Solve for x
   x = 114,994,967.78/9,360.79
6. Step 6: Final answer
   x = 12,284.75