Finding the Fourth Proportional to 2,662.60, 3,990.10 and 1,963.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.60 : 3,990.10 = 1,963.76 : x
2. Step 2: Convert to fraction form
   2,662.60/3,990.10 = 1,963.76/x
3. Step 3: Cross multiply
   2,662.60x = 3,990.10 × 1,963.76
4. Step 4: Simplify right side
   2,662.60x = 7,835,598.78
5. Step 5: Solve for x
   x = 7,835,598.78/2,662.60
6. Step 6: Final answer
   x = 2,942.84