Finding the Fourth Proportional to 1,478.69, 2,039.69 and 880.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.69 : 2,039.69 = 880.79 : x
2. Step 2: Convert to fraction form
   1,478.69/2,039.69 = 880.79/x
3. Step 3: Cross multiply
   1,478.69x = 2,039.69 × 880.79
4. Step 4: Simplify right side
   1,478.69x = 1,796,523.95
5. Step 5: Solve for x
   x = 1,796,523.95/1,478.69
6. Step 6: Final answer
   x = 1,214.95