Finding the Fourth Proportional to 1,705.62, 2,557.41 and 915.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,705.62 : 2,557.41 = 915.42 : x
2. Step 2: Convert to fraction form
   1,705.62/2,557.41 = 915.42/x
3. Step 3: Cross multiply
   1,705.62x = 2,557.41 × 915.42
4. Step 4: Simplify right side
   1,705.62x = 2,341,104.26
5. Step 5: Solve for x
   x = 2,341,104.26/1,705.62
6. Step 6: Final answer
   x = 1,372.58