Finding the Fourth Proportional to 1,062.52, 1,590.05 and 811.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,062.52 : 1,590.05 = 811.91 : x
2. Step 2: Convert to fraction form
   1,062.52/1,590.05 = 811.91/x
3. Step 3: Cross multiply
   1,062.52x = 1,590.05 × 811.91
4. Step 4: Simplify right side
   1,062.52x = 1,290,983.50
5. Step 5: Solve for x
   x = 1,290,983.50/1,062.52
6. Step 6: Final answer
   x = 1,215.02