Finding the Fourth Proportional to 2,543.47, 3,815.88 and 899.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.47 : 3,815.88 = 899.80 : x
2. Step 2: Convert to fraction form
   2,543.47/3,815.88 = 899.80/x
3. Step 3: Cross multiply
   2,543.47x = 3,815.88 × 899.80
4. Step 4: Simplify right side
   2,543.47x = 3,433,528.82
5. Step 5: Solve for x
   x = 3,433,528.82/2,543.47
6. Step 6: Final answer
   x = 1,349.94