Finding the Fourth Proportional to 1,426.40, 2,141.72 and 880.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.40 : 2,141.72 = 880.86 : x
2. Step 2: Convert to fraction form
   1,426.40/2,141.72 = 880.86/x
3. Step 3: Cross multiply
   1,426.40x = 2,141.72 × 880.86
4. Step 4: Simplify right side
   1,426.40x = 1,886,555.48
5. Step 5: Solve for x
   x = 1,886,555.48/1,426.40
6. Step 6: Final answer
   x = 1,322.60