Finding the Fourth Proportional to 1,271.61, 1,754.83 and 774.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.61 : 1,754.83 = 774.15 : x
2. Step 2: Convert to fraction form
   1,271.61/1,754.83 = 774.15/x
3. Step 3: Cross multiply
   1,271.61x = 1,754.83 × 774.15
4. Step 4: Simplify right side
   1,271.61x = 1,358,501.64
5. Step 5: Solve for x
   x = 1,358,501.64/1,271.61
6. Step 6: Final answer
   x = 1,068.33