Finding the Fourth Proportional to 1,581.60, 2,178.72 and 1,426.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.60 : 2,178.72 = 1,426.08 : x
2. Step 2: Convert to fraction form
   1,581.60/2,178.72 = 1,426.08/x
3. Step 3: Cross multiply
   1,581.60x = 2,178.72 × 1,426.08
4. Step 4: Simplify right side
   1,581.60x = 3,107,029.02
5. Step 5: Solve for x
   x = 3,107,029.02/1,581.60
6. Step 6: Final answer
   x = 1,964.48