Finding the Fourth Proportional to 1,085.86, 1,498.52 and 613.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.86 : 1,498.52 = 613.77 : x
2. Step 2: Convert to fraction form
   1,085.86/1,498.52 = 613.77/x
3. Step 3: Cross multiply
   1,085.86x = 1,498.52 × 613.77
4. Step 4: Simplify right side
   1,085.86x = 919,748.15
5. Step 5: Solve for x
   x = 919,748.15/1,085.86
6. Step 6: Final answer
   x = 847.02