Finding the Fourth Proportional to 1,667.76, 2,301.60 and 1,078.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.76 : 2,301.60 = 1,078.80 : x
2. Step 2: Convert to fraction form
   1,667.76/2,301.60 = 1,078.80/x
3. Step 3: Cross multiply
   1,667.76x = 2,301.60 × 1,078.80
4. Step 4: Simplify right side
   1,667.76x = 2,482,966.08
5. Step 5: Solve for x
   x = 2,482,966.08/1,667.76
6. Step 6: Final answer
   x = 1,488.80