Finding the Fourth Proportional to 1,384.67, 2,077.61 and 1,280.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.67 : 2,077.61 = 1,280.18 : x
2. Step 2: Convert to fraction form
   1,384.67/2,077.61 = 1,280.18/x
3. Step 3: Cross multiply
   1,384.67x = 2,077.61 × 1,280.18
4. Step 4: Simplify right side
   1,384.67x = 2,659,697.98
5. Step 5: Solve for x
   x = 2,659,697.98/1,384.67
6. Step 6: Final answer
   x = 1,920.82