Finding the Fourth Proportional to 3,689.31, 5,533.82 and 915.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,689.31 : 5,533.82 = 915.92 : x
2. Step 2: Convert to fraction form
   3,689.31/5,533.82 = 915.92/x
3. Step 3: Cross multiply
   3,689.31x = 5,533.82 × 915.92
4. Step 4: Simplify right side
   3,689.31x = 5,068,559.48
5. Step 5: Solve for x
   x = 5,068,559.48/3,689.31
6. Step 6: Final answer
   x = 1,373.85