Finding the Fourth Proportional to 4,915.88, 6,780.56 and 3,146.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4,915.88 : 6,780.56 = 3,146.72 : x
2. Step 2: Convert to fraction form
   4,915.88/6,780.56 = 3,146.72/x
3. Step 3: Cross multiply
   4,915.88x = 6,780.56 × 3,146.72
4. Step 4: Simplify right side
   4,915.88x = 21,336,523.76
5. Step 5: Solve for x
   x = 21,336,523.76/4,915.88
6. Step 6: Final answer
   x = 4,340.33