Finding the Fourth Proportional to 1,778.20, 2,453.82 and 992.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,778.20 : 2,453.82 = 992.10 : x
2. Step 2: Convert to fraction form
   1,778.20/2,453.82 = 992.10/x
3. Step 3: Cross multiply
   1,778.20x = 2,453.82 × 992.10
4. Step 4: Simplify right side
   1,778.20x = 2,434,434.82
5. Step 5: Solve for x
   x = 2,434,434.82/1,778.20
6. Step 6: Final answer
   x = 1,369.04