Finding the Fourth Proportional to 2,542.89, 3,815.34 and 899.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,542.89 : 3,815.34 = 899.61 : x
2. Step 2: Convert to fraction form
   2,542.89/3,815.34 = 899.61/x
3. Step 3: Cross multiply
   2,542.89x = 3,815.34 × 899.61
4. Step 4: Simplify right side
   2,542.89x = 3,432,318.02
5. Step 5: Solve for x
   x = 3,432,318.02/2,542.89
6. Step 6: Final answer
   x = 1,349.77