Finding the Fourth Proportional to 1,979.42, 2,732.46 and 1,392.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,979.42 : 2,732.46 = 1,392.14 : x
2. Step 2: Convert to fraction form
   1,979.42/2,732.46 = 1,392.14/x
3. Step 3: Cross multiply
   1,979.42x = 2,732.46 × 1,392.14
4. Step 4: Simplify right side
   1,979.42x = 3,803,966.86
5. Step 5: Solve for x
   x = 3,803,966.86/1,979.42
6. Step 6: Final answer
   x = 1,921.76