Finding the Fourth Proportional to 1,870.72, 2,804.76 and 774.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.72 : 2,804.76 = 774.80 : x
2. Step 2: Convert to fraction form
   1,870.72/2,804.76 = 774.80/x
3. Step 3: Cross multiply
   1,870.72x = 2,804.76 × 774.80
4. Step 4: Simplify right side
   1,870.72x = 2,173,128.05
5. Step 5: Solve for x
   x = 2,173,128.05/1,870.72
6. Step 6: Final answer
   x = 1,161.65