Finding the Fourth Proportional to 1,085.31, 1,625.66 and 500.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.31 : 1,625.66 = 500.79 : x
2. Step 2: Convert to fraction form
   1,085.31/1,625.66 = 500.79/x
3. Step 3: Cross multiply
   1,085.31x = 1,625.66 × 500.79
4. Step 4: Simplify right side
   1,085.31x = 814,114.27
5. Step 5: Solve for x
   x = 814,114.27/1,085.31
6. Step 6: Final answer
   x = 750.12