Finding the Fourth Proportional to 2,376.39, 3,565.05 and 915.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,376.39 : 3,565.05 = 915.55 : x
2. Step 2: Convert to fraction form
   2,376.39/3,565.05 = 915.55/x
3. Step 3: Cross multiply
   2,376.39x = 3,565.05 × 915.55
4. Step 4: Simplify right side
   2,376.39x = 3,263,981.53
5. Step 5: Solve for x
   x = 3,263,981.53/2,376.39
6. Step 6: Final answer
   x = 1,373.51