Finding the Fourth Proportional to 1,085.74, 1,498.52 and 619.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.74 : 1,498.52 = 619.99 : x
2. Step 2: Convert to fraction form
   1,085.74/1,498.52 = 619.99/x
3. Step 3: Cross multiply
   1,085.74x = 1,498.52 × 619.99
4. Step 4: Simplify right side
   1,085.74x = 929,056.82
5. Step 5: Solve for x
   x = 929,056.82/1,085.74
6. Step 6: Final answer
   x = 855.69