Finding the Fourth Proportional to 2,938.32, 4,407.56 and 858.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,938.32 : 4,407.56 = 858.56 : x
2. Step 2: Convert to fraction form
   2,938.32/4,407.56 = 858.56/x
3. Step 3: Cross multiply
   2,938.32x = 4,407.56 × 858.56
4. Step 4: Simplify right side
   2,938.32x = 3,784,154.71
5. Step 5: Solve for x
   x = 3,784,154.71/2,938.32
6. Step 6: Final answer
   x = 1,287.86