Finding the Fourth Proportional to 2,611.10, 3,916.69 and 663.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.10 : 3,916.69 = 663.32 : x
2. Step 2: Convert to fraction form
   2,611.10/3,916.69 = 663.32/x
3. Step 3: Cross multiply
   2,611.10x = 3,916.69 × 663.32
4. Step 4: Simplify right side
   2,611.10x = 2,598,026.94
5. Step 5: Solve for x
   x = 2,598,026.94/2,611.10
6. Step 6: Final answer
   x = 994.99