Finding the Fourth Proportional to 1,939.71, 2,887.63 and 1,928.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,939.71 : 2,887.63 = 1,928.18 : x
2. Step 2: Convert to fraction form
   1,939.71/2,887.63 = 1,928.18/x
3. Step 3: Cross multiply
   1,939.71x = 2,887.63 × 1,928.18
4. Step 4: Simplify right side
   1,939.71x = 5,567,846.33
5. Step 5: Solve for x
   x = 5,567,846.33/1,939.71
6. Step 6: Final answer
   x = 2,870.45