Finding the Fourth Proportional to 1,042.38, 1,562.61 and 810

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.38 : 1,562.61 = 810 : x
2. Step 2: Convert to fraction form
   1,042.38/1,562.61 = 810/x
3. Step 3: Cross multiply
   1,042.38x = 1,562.61 × 810
4. Step 4: Simplify right side
   1,042.38x = 1,265,714.10
5. Step 5: Solve for x
   x = 1,265,714.10/1,042.38
6. Step 6: Final answer
   x = 1,214.25