Finding the Fourth Proportional to 2,861.01, 4,290.59 and 912.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.01 : 4,290.59 = 912.75 : x
2. Step 2: Convert to fraction form
   2,861.01/4,290.59 = 912.75/x
3. Step 3: Cross multiply
   2,861.01x = 4,290.59 × 912.75
4. Step 4: Simplify right side
   2,861.01x = 3,916,231.46
5. Step 5: Solve for x
   x = 3,916,231.46/2,861.01
6. Step 6: Final answer
   x = 1,368.83