Finding the Fourth Proportional to 1,641.72, 2,263.83 and 1,406.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.72 : 2,263.83 = 1,406.43 : x
2. Step 2: Convert to fraction form
   1,641.72/2,263.83 = 1,406.43/x
3. Step 3: Cross multiply
   1,641.72x = 2,263.83 × 1,406.43
4. Step 4: Simplify right side
   1,641.72x = 3,183,918.43
5. Step 5: Solve for x
   x = 3,183,918.43/1,641.72
6. Step 6: Final answer
   x = 1,939.38