Finding the Fourth Proportional to 1,977.88, 2,729.52 and 1,280.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,977.88 : 2,729.52 = 1,280.47 : x
2. Step 2: Convert to fraction form
   1,977.88/2,729.52 = 1,280.47/x
3. Step 3: Cross multiply
   1,977.88x = 2,729.52 × 1,280.47
4. Step 4: Simplify right side
   1,977.88x = 3,495,048.42
5. Step 5: Solve for x
   x = 3,495,048.42/1,977.88
6. Step 6: Final answer
   x = 1,767.07