Finding the Fourth Proportional to 2,611.58, 3,916.45 and 762.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.58 : 3,916.45 = 762.21 : x
2. Step 2: Convert to fraction form
   2,611.58/3,916.45 = 762.21/x
3. Step 3: Cross multiply
   2,611.58x = 3,916.45 × 762.21
4. Step 4: Simplify right side
   2,611.58x = 2,985,158.31
5. Step 5: Solve for x
   x = 2,985,158.31/2,611.58
6. Step 6: Final answer
   x = 1,143.05