Finding the Fourth Proportional to 1,839.90, 2,757.69 and 915.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,839.90 : 2,757.69 = 915.18 : x
2. Step 2: Convert to fraction form
   1,839.90/2,757.69 = 915.18/x
3. Step 3: Cross multiply
   1,839.90x = 2,757.69 × 915.18
4. Step 4: Simplify right side
   1,839.90x = 2,523,782.73
5. Step 5: Solve for x
   x = 2,523,782.73/1,839.90
6. Step 6: Final answer
   x = 1,371.70