Finding the Fourth Proportional to 2,510.79, 3,766.40 and 661.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,510.79 : 3,766.40 = 661.89 : x
2. Step 2: Convert to fraction form
   2,510.79/3,766.40 = 661.89/x
3. Step 3: Cross multiply
   2,510.79x = 3,766.40 × 661.89
4. Step 4: Simplify right side
   2,510.79x = 2,492,942.50
5. Step 5: Solve for x
   x = 2,492,942.50/2,510.79
6. Step 6: Final answer
   x = 992.89