Finding the Fourth Proportional to 1,434.58, 1,977.82 and 1,288.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.58 : 1,977.82 = 1,288.78 : x
2. Step 2: Convert to fraction form
   1,434.58/1,977.82 = 1,288.78/x
3. Step 3: Cross multiply
   1,434.58x = 1,977.82 × 1,288.78
4. Step 4: Simplify right side
   1,434.58x = 2,548,974.86
5. Step 5: Solve for x
   x = 2,548,974.86/1,434.58
6. Step 6: Final answer
   x = 1,776.81