Finding the Fourth Proportional to 1,280.01, 1,920.15 and 1,178.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.01 : 1,920.15 = 1,178.58 : x
2. Step 2: Convert to fraction form
   1,280.01/1,920.15 = 1,178.58/x
3. Step 3: Cross multiply
   1,280.01x = 1,920.15 × 1,178.58
4. Step 4: Simplify right side
   1,280.01x = 2,263,050.39
5. Step 5: Solve for x
   x = 2,263,050.39/1,280.01
6. Step 6: Final answer
   x = 1,767.99