Finding the Fourth Proportional to 1,939.77, 2,920.98 and 1,395.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,939.77 : 2,920.98 = 1,395.72 : x
2. Step 2: Convert to fraction form
   1,939.77/2,920.98 = 1,395.72/x
3. Step 3: Cross multiply
   1,939.77x = 2,920.98 × 1,395.72
4. Step 4: Simplify right side
   1,939.77x = 4,076,870.21
5. Step 5: Solve for x
   x = 4,076,870.21/1,939.77
6. Step 6: Final answer
   x = 2,101.73