Finding the Fourth Proportional to 1,086.16, 1,498.74 and 613.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.16 : 1,498.74 = 613.93 : x
2. Step 2: Convert to fraction form
   1,086.16/1,498.74 = 613.93/x
3. Step 3: Cross multiply
   1,086.16x = 1,498.74 × 613.93
4. Step 4: Simplify right side
   1,086.16x = 920,121.45
5. Step 5: Solve for x
   x = 920,121.45/1,086.16
6. Step 6: Final answer
   x = 847.13