Finding the Fourth Proportional to 1,101.21, 1,650.87 and 613.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.21 : 1,650.87 = 613.59 : x
2. Step 2: Convert to fraction form
   1,101.21/1,650.87 = 613.59/x
3. Step 3: Cross multiply
   1,101.21x = 1,650.87 × 613.59
4. Step 4: Simplify right side
   1,101.21x = 1,012,957.32
5. Step 5: Solve for x
   x = 1,012,957.32/1,101.21
6. Step 6: Final answer
   x = 919.86