Finding the Fourth Proportional to 1,778.72, 2,454.63 and 992.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,778.72 : 2,454.63 = 992.72 : x
2. Step 2: Convert to fraction form
   1,778.72/2,454.63 = 992.72/x
3. Step 3: Cross multiply
   1,778.72x = 2,454.63 × 992.72
4. Step 4: Simplify right side
   1,778.72x = 2,436,760.29
5. Step 5: Solve for x
   x = 2,436,760.29/1,778.72
6. Step 6: Final answer
   x = 1,369.95