Finding the Fourth Proportional to 2,126.61, 3,189.43 and 810.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,126.61 : 3,189.43 = 810.52 : x
2. Step 2: Convert to fraction form
   2,126.61/3,189.43 = 810.52/x
3. Step 3: Cross multiply
   2,126.61x = 3,189.43 × 810.52
4. Step 4: Simplify right side
   2,126.61x = 2,585,080.86
5. Step 5: Solve for x
   x = 2,585,080.86/2,126.61
6. Step 6: Final answer
   x = 1,215.59