Finding the Fourth Proportional to 1,100.91, 1,650.83 and 407.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.91 : 1,650.83 = 407.91 : x
2. Step 2: Convert to fraction form
   1,100.91/1,650.83 = 407.91/x
3. Step 3: Cross multiply
   1,100.91x = 1,650.83 × 407.91
4. Step 4: Simplify right side
   1,100.91x = 673,390.07
5. Step 5: Solve for x
   x = 673,390.07/1,100.91
6. Step 6: Final answer
   x = 611.67