Finding the Fourth Proportional to 2,115.44, 2,919.27 and 1,667.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.44 : 2,919.27 = 1,667.78 : x
2. Step 2: Convert to fraction form
   2,115.44/2,919.27 = 1,667.78/x
3. Step 3: Cross multiply
   2,115.44x = 2,919.27 × 1,667.78
4. Step 4: Simplify right side
   2,115.44x = 4,868,700.12
5. Step 5: Solve for x
   x = 4,868,700.12/2,115.44
6. Step 6: Final answer
   x = 2,301.51