Finding the Fourth Proportional to 2,473.72, 3,712.46 and 915.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,473.72 : 3,712.46 = 915.20 : x
2. Step 2: Convert to fraction form
   2,473.72/3,712.46 = 915.20/x
3. Step 3: Cross multiply
   2,473.72x = 3,712.46 × 915.20
4. Step 4: Simplify right side
   2,473.72x = 3,397,620.25
5. Step 5: Solve for x
   x = 3,397,620.25/2,473.72
6. Step 6: Final answer
   x = 1,373.49