Finding the Fourth Proportional to 1,356.89, 1,872.92 and 915.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.89 : 1,872.92 = 915.44 : x
2. Step 2: Convert to fraction form
   1,356.89/1,872.92 = 915.44/x
3. Step 3: Cross multiply
   1,356.89x = 1,872.92 × 915.44
4. Step 4: Simplify right side
   1,356.89x = 1,714,538.81
5. Step 5: Solve for x
   x = 1,714,538.81/1,356.89
6. Step 6: Final answer
   x = 1,263.58