Finding the Fourth Proportional to 1,763.69, 2,645.89 and 789.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,763.69 : 2,645.89 = 789.80 : x
2. Step 2: Convert to fraction form
   1,763.69/2,645.89 = 789.80/x
3. Step 3: Cross multiply
   1,763.69x = 2,645.89 × 789.80
4. Step 4: Simplify right side
   1,763.69x = 2,089,728.56
5. Step 5: Solve for x
   x = 2,089,728.56/1,763.69
6. Step 6: Final answer
   x = 1,184.86