Finding the Fourth Proportional to 1,418.86, 1,955.10 and 1,399.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.86 : 1,955.10 = 1,399.72 : x
2. Step 2: Convert to fraction form
   1,418.86/1,955.10 = 1,399.72/x
3. Step 3: Cross multiply
   1,418.86x = 1,955.10 × 1,399.72
4. Step 4: Simplify right side
   1,418.86x = 2,736,596.19
5. Step 5: Solve for x
   x = 2,736,596.19/1,418.86
6. Step 6: Final answer
   x = 1,928.73