Finding the Fourth Proportional to 1,426.68, 1,980.36 and 1,392.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.68 : 1,980.36 = 1,392.12 : x
2. Step 2: Convert to fraction form
   1,426.68/1,980.36 = 1,392.12/x
3. Step 3: Cross multiply
   1,426.68x = 1,980.36 × 1,392.12
4. Step 4: Simplify right side
   1,426.68x = 2,756,898.76
5. Step 5: Solve for x
   x = 2,756,898.76/1,426.68
6. Step 6: Final answer
   x = 1,932.39