Finding the Fourth Proportional to 2,542.79, 3,812.90 and 899.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,542.79 : 3,812.90 = 899.10 : x
2. Step 2: Convert to fraction form
   2,542.79/3,812.90 = 899.10/x
3. Step 3: Cross multiply
   2,542.79x = 3,812.90 × 899.10
4. Step 4: Simplify right side
   2,542.79x = 3,428,173.89
5. Step 5: Solve for x
   x = 3,428,173.89/2,542.79
6. Step 6: Final answer
   x = 1,348.20