Finding the Fourth Proportional to 1,796.20, 2,478.62 and 999.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,796.20 : 2,478.62 = 999.47 : x
2. Step 2: Convert to fraction form
   1,796.20/2,478.62 = 999.47/x
3. Step 3: Cross multiply
   1,796.20x = 2,478.62 × 999.47
4. Step 4: Simplify right side
   1,796.20x = 2,477,288.94
5. Step 5: Solve for x
   x = 2,477,288.94/1,796.20
6. Step 6: Final answer
   x = 1,379.18