Finding the Fourth Proportional to 1,990.71, 2,746.71 and 1,392.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,990.71 : 2,746.71 = 1,392.46 : x
2. Step 2: Convert to fraction form
   1,990.71/2,746.71 = 1,392.46/x
3. Step 3: Cross multiply
   1,990.71x = 2,746.71 × 1,392.46
4. Step 4: Simplify right side
   1,990.71x = 3,824,676.94
5. Step 5: Solve for x
   x = 3,824,676.94/1,990.71
6. Step 6: Final answer
   x = 1,921.26