Finding the Fourth Proportional to 2,611.12, 3,916.56 and 762.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.12 : 3,916.56 = 762.16 : x
2. Step 2: Convert to fraction form
   2,611.12/3,916.56 = 762.16/x
3. Step 3: Cross multiply
   2,611.12x = 3,916.56 × 762.16
4. Step 4: Simplify right side
   2,611.12x = 2,985,045.37
5. Step 5: Solve for x
   x = 2,985,045.37/2,611.12
6. Step 6: Final answer
   x = 1,143.20