Finding the Fourth Proportional to 3,380.25, 5,069.89 and 915.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,380.25 : 5,069.89 = 915.22 : x
2. Step 2: Convert to fraction form
   3,380.25/5,069.89 = 915.22/x
3. Step 3: Cross multiply
   3,380.25x = 5,069.89 × 915.22
4. Step 4: Simplify right side
   3,380.25x = 4,640,064.73
5. Step 5: Solve for x
   x = 4,640,064.73/3,380.25
6. Step 6: Final answer
   x = 1,372.70