Finding the Fourth Proportional to 1,870.40, 2,804.57 and 774.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.40 : 2,804.57 = 774.15 : x
2. Step 2: Convert to fraction form
   1,870.40/2,804.57 = 774.15/x
3. Step 3: Cross multiply
   1,870.40x = 2,804.57 × 774.15
4. Step 4: Simplify right side
   1,870.40x = 2,171,157.87
5. Step 5: Solve for x
   x = 2,171,157.87/1,870.40
6. Step 6: Final answer
   x = 1,160.80