Finding the Fourth Proportional to 1,974.78, 2,726.46 and 1,386.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,974.78 : 2,726.46 = 1,386.72 : x
2. Step 2: Convert to fraction form
   1,974.78/2,726.46 = 1,386.72/x
3. Step 3: Cross multiply
   1,974.78x = 2,726.46 × 1,386.72
4. Step 4: Simplify right side
   1,974.78x = 3,780,836.61
5. Step 5: Solve for x
   x = 3,780,836.61/1,974.78
6. Step 6: Final answer
   x = 1,914.56