Finding the Fourth Proportional to 1,008.18, 1,390.05 and 797.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.18 : 1,390.05 = 797.94 : x
2. Step 2: Convert to fraction form
   1,008.18/1,390.05 = 797.94/x
3. Step 3: Cross multiply
   1,008.18x = 1,390.05 × 797.94
4. Step 4: Simplify right side
   1,008.18x = 1,109,176.50
5. Step 5: Solve for x
   x = 1,109,176.50/1,008.18
6. Step 6: Final answer
   x = 1,100.18