Finding the Fourth Proportional to 1,540.53, 2,314.98 and 810.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540.53 : 2,314.98 = 810.45 : x
2. Step 2: Convert to fraction form
   1,540.53/2,314.98 = 810.45/x
3. Step 3: Cross multiply
   1,540.53x = 2,314.98 × 810.45
4. Step 4: Simplify right side
   1,540.53x = 1,876,175.54
5. Step 5: Solve for x
   x = 1,876,175.54/1,540.53
6. Step 6: Final answer
   x = 1,217.88