Finding the Fourth Proportional to 2,647.52, 3,970.56 and 915.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.52 : 3,970.56 = 915.92 : x
2. Step 2: Convert to fraction form
   2,647.52/3,970.56 = 915.92/x
3. Step 3: Cross multiply
   2,647.52x = 3,970.56 × 915.92
4. Step 4: Simplify right side
   2,647.52x = 3,636,715.32
5. Step 5: Solve for x
   x = 3,636,715.32/2,647.52
6. Step 6: Final answer
   x = 1,373.63