Finding the Fourth Proportional to 1,870.64, 2,804.28 and 774.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.64 : 2,804.28 = 774.30 : x
2. Step 2: Convert to fraction form
   1,870.64/2,804.28 = 774.30/x
3. Step 3: Cross multiply
   1,870.64x = 2,804.28 × 774.30
4. Step 4: Simplify right side
   1,870.64x = 2,171,354.00
5. Step 5: Solve for x
   x = 2,171,354.00/1,870.64
6. Step 6: Final answer
   x = 1,160.76