Finding the Fourth Proportional to 1,357.56, 1,874.34 and 915.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.56 : 1,874.34 = 915.30 : x
2. Step 2: Convert to fraction form
   1,357.56/1,874.34 = 915.30/x
3. Step 3: Cross multiply
   1,357.56x = 1,874.34 × 915.30
4. Step 4: Simplify right side
   1,357.56x = 1,715,583.40
5. Step 5: Solve for x
   x = 1,715,583.40/1,357.56
6. Step 6: Final answer
   x = 1,263.73