Finding the Fourth Proportional to 2,453.25, 3,680.69 and 991.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,453.25 : 3,680.69 = 991.61 : x
2. Step 2: Convert to fraction form
   2,453.25/3,680.69 = 991.61/x
3. Step 3: Cross multiply
   2,453.25x = 3,680.69 × 991.61
4. Step 4: Simplify right side
   2,453.25x = 3,649,809.01
5. Step 5: Solve for x
   x = 3,649,809.01/2,453.25
6. Step 6: Final answer
   x = 1,487.74