Finding the Fourth Proportional to 1,879.61, 2,817.89 and 784.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,879.61 : 2,817.89 = 784.79 : x
2. Step 2: Convert to fraction form
   1,879.61/2,817.89 = 784.79/x
3. Step 3: Cross multiply
   1,879.61x = 2,817.89 × 784.79
4. Step 4: Simplify right side
   1,879.61x = 2,211,454.14
5. Step 5: Solve for x
   x = 2,211,454.14/1,879.61
6. Step 6: Final answer
   x = 1,176.55