Finding the Fourth Proportional to 1,870.64, 2,805.24 and 774.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.64 : 2,805.24 = 774.72 : x
2. Step 2: Convert to fraction form
   1,870.64/2,805.24 = 774.72/x
3. Step 3: Cross multiply
   1,870.64x = 2,805.24 × 774.72
4. Step 4: Simplify right side
   1,870.64x = 2,173,275.53
5. Step 5: Solve for x
   x = 2,173,275.53/1,870.64
6. Step 6: Final answer
   x = 1,161.78