Finding the Fourth Proportional to 1,447.79, 1,997.88 and 818.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,447.79 : 1,997.88 = 818.15 : x
2. Step 2: Convert to fraction form
   1,447.79/1,997.88 = 818.15/x
3. Step 3: Cross multiply
   1,447.79x = 1,997.88 × 818.15
4. Step 4: Simplify right side
   1,447.79x = 1,634,565.52
5. Step 5: Solve for x
   x = 1,634,565.52/1,447.79
6. Step 6: Final answer
   x = 1,129.01