Finding the Fourth Proportional to 2,224.73, 3,336.69 and 991.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,224.73 : 3,336.69 = 991.91 : x
2. Step 2: Convert to fraction form
   2,224.73/3,336.69 = 991.91/x
3. Step 3: Cross multiply
   2,224.73x = 3,336.69 × 991.91
4. Step 4: Simplify right side
   2,224.73x = 3,309,704.52
5. Step 5: Solve for x
   x = 3,309,704.52/2,224.73
6. Step 6: Final answer
   x = 1,487.69