Finding the Fourth Proportional to 2,865.71, 4,296.47 and 916.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,865.71 : 4,296.47 = 916.79 : x
2. Step 2: Convert to fraction form
   2,865.71/4,296.47 = 916.79/x
3. Step 3: Cross multiply
   2,865.71x = 4,296.47 × 916.79
4. Step 4: Simplify right side
   2,865.71x = 3,938,956.15
5. Step 5: Solve for x
   x = 3,938,956.15/2,865.71
6. Step 6: Final answer
   x = 1,374.51