Finding the Fourth Proportional to 1,778.20, 2,667.42 and 997.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,778.20 : 2,667.42 = 997.61 : x
2. Step 2: Convert to fraction form
   1,778.20/2,667.42 = 997.61/x
3. Step 3: Cross multiply
   1,778.20x = 2,667.42 × 997.61
4. Step 4: Simplify right side
   1,778.20x = 2,661,039.88
5. Step 5: Solve for x
   x = 2,661,039.88/1,778.20
6. Step 6: Final answer
   x = 1,496.48