Finding the Fourth Proportional to 8,662.64, 12,990.74 and 3,114.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,662.64 : 12,990.74 = 3,114.50 : x
2. Step 2: Convert to fraction form
   8,662.64/12,990.74 = 3,114.50/x
3. Step 3: Cross multiply
   8,662.64x = 12,990.74 × 3,114.50
4. Step 4: Simplify right side
   8,662.64x = 40,459,579.20
5. Step 5: Solve for x
   x = 40,459,579.20/8,662.64
6. Step 6: Final answer
   x = 4,670.59