Finding the Fourth Proportional to 1,101.42, 1,650.78 and 613.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.42 : 1,650.78 = 613.80 : x
2. Step 2: Convert to fraction form
   1,101.42/1,650.78 = 613.80/x
3. Step 3: Cross multiply
   1,101.42x = 1,650.78 × 613.80
4. Step 4: Simplify right side
   1,101.42x = 1,013,248.76
5. Step 5: Solve for x
   x = 1,013,248.76/1,101.42
6. Step 6: Final answer
   x = 919.95