Finding the Fourth Proportional to 2,069.48, 3,105.30 and 915.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.48 : 3,105.30 = 915.32 : x
2. Step 2: Convert to fraction form
   2,069.48/3,105.30 = 915.32/x
3. Step 3: Cross multiply
   2,069.48x = 3,105.30 × 915.32
4. Step 4: Simplify right side
   2,069.48x = 2,842,343.20
5. Step 5: Solve for x
   x = 2,842,343.20/2,069.48
6. Step 6: Final answer
   x = 1,373.46