Finding the Fourth Proportional to 1,892.44, 2,612.28 and 1,399.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,892.44 : 2,612.28 = 1,399.05 : x
2. Step 2: Convert to fraction form
   1,892.44/2,612.28 = 1,399.05/x
3. Step 3: Cross multiply
   1,892.44x = 2,612.28 × 1,399.05
4. Step 4: Simplify right side
   1,892.44x = 3,654,710.33
5. Step 5: Solve for x
   x = 3,654,710.33/1,892.44
6. Step 6: Final answer
   x = 1,931.22