Finding the Fourth Proportional to 3,381.24, 5,071.59 and 915.99

Step by Step Solution

1. Step 1: Write the proportion equation
   3,381.24 : 5,071.59 = 915.99 : x
2. Step 2: Convert to fraction form
   3,381.24/5,071.59 = 915.99/x
3. Step 3: Cross multiply
   3,381.24x = 5,071.59 × 915.99
4. Step 4: Simplify right side
   3,381.24x = 4,645,525.72
5. Step 5: Solve for x
   x = 4,645,525.72/3,381.24
6. Step 6: Final answer
   x = 1,373.91