Finding the Fourth Proportional to 2,543.54, 3,815.20 and 900.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.54 : 3,815.20 = 900.10 : x
2. Step 2: Convert to fraction form
   2,543.54/3,815.20 = 900.10/x
3. Step 3: Cross multiply
   2,543.54x = 3,815.20 × 900.10
4. Step 4: Simplify right side
   2,543.54x = 3,434,061.52
5. Step 5: Solve for x
   x = 3,434,061.52/2,543.54
6. Step 6: Final answer
   x = 1,350.11