Finding the Fourth Proportional to 2,290.86, 3,436.47 and 810.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.86 : 3,436.47 = 810.18 : x
2. Step 2: Convert to fraction form
   2,290.86/3,436.47 = 810.18/x
3. Step 3: Cross multiply
   2,290.86x = 3,436.47 × 810.18
4. Step 4: Simplify right side
   2,290.86x = 2,784,159.26
5. Step 5: Solve for x
   x = 2,784,159.26/2,290.86
6. Step 6: Final answer
   x = 1,215.33