Finding the Fourth Proportional to 2,300.79, 3,449.23 and 915.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,300.79 : 3,449.23 = 915.10 : x
2. Step 2: Convert to fraction form
   2,300.79/3,449.23 = 915.10/x
3. Step 3: Cross multiply
   2,300.79x = 3,449.23 × 915.10
4. Step 4: Simplify right side
   2,300.79x = 3,156,385.80
5. Step 5: Solve for x
   x = 3,156,385.80/2,300.79
6. Step 6: Final answer
   x = 1,371.87