Finding the Fourth Proportional to 1,085.99, 1,498.86 and 620.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.99 : 1,498.86 = 620.24 : x
2. Step 2: Convert to fraction form
   1,085.99/1,498.86 = 620.24/x
3. Step 3: Cross multiply
   1,085.99x = 1,498.86 × 620.24
4. Step 4: Simplify right side
   1,085.99x = 929,645.43
5. Step 5: Solve for x
   x = 929,645.43/1,085.99
6. Step 6: Final answer
   x = 856.04