Finding the Fourth Proportional to 1,520.81, 2,099.75 and 997.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.81 : 2,099.75 = 997.73 : x
2. Step 2: Convert to fraction form
   1,520.81/2,099.75 = 997.73/x
3. Step 3: Cross multiply
   1,520.81x = 2,099.75 × 997.73
4. Step 4: Simplify right side
   1,520.81x = 2,094,978.58
5. Step 5: Solve for x
   x = 2,094,978.58/1,520.81
6. Step 6: Final answer
   x = 1,377.54