Finding the Fourth Proportional to 1,665.84, 2,498.52 and 915.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.84 : 2,498.52 = 915.58 : x
2. Step 2: Convert to fraction form
   1,665.84/2,498.52 = 915.58/x
3. Step 3: Cross multiply
   1,665.84x = 2,498.52 × 915.58
4. Step 4: Simplify right side
   1,665.84x = 2,287,594.94
5. Step 5: Solve for x
   x = 2,287,594.94/1,665.84
6. Step 6: Final answer
   x = 1,373.24