Finding the Fourth Proportional to 2,764.40, 4,146.72 and 915.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,764.40 : 4,146.72 = 915.68 : x
2. Step 2: Convert to fraction form
   2,764.40/4,146.72 = 915.68/x
3. Step 3: Cross multiply
   2,764.40x = 4,146.72 × 915.68
4. Step 4: Simplify right side
   2,764.40x = 3,797,068.57
5. Step 5: Solve for x
   x = 3,797,068.57/2,764.40
6. Step 6: Final answer
   x = 1,373.56