Finding the Fourth Proportional to 2,864.50, 4,296.88 and 916.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,864.50 : 4,296.88 = 916.72 : x
2. Step 2: Convert to fraction form
   2,864.50/4,296.88 = 916.72/x
3. Step 3: Cross multiply
   2,864.50x = 4,296.88 × 916.72
4. Step 4: Simplify right side
   2,864.50x = 3,939,026.24
5. Step 5: Solve for x
   x = 3,939,026.24/2,864.50
6. Step 6: Final answer
   x = 1,375.12