Finding the Fourth Proportional to 1,611.55, 2,414.73 and 916.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,611.55 : 2,414.73 = 916.15 : x
2. Step 2: Convert to fraction form
   1,611.55/2,414.73 = 916.15/x
3. Step 3: Cross multiply
   1,611.55x = 2,414.73 × 916.15
4. Step 4: Simplify right side
   1,611.55x = 2,212,254.89
5. Step 5: Solve for x
   x = 2,212,254.89/1,611.55
6. Step 6: Final answer
   x = 1,372.75