Finding the Fourth Proportional to 1,439.82, 2,167.47 and 1,305.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.82 : 2,167.47 = 1,305.72 : x
2. Step 2: Convert to fraction form
   1,439.82/2,167.47 = 1,305.72/x
3. Step 3: Cross multiply
   1,439.82x = 2,167.47 × 1,305.72
4. Step 4: Simplify right side
   1,439.82x = 2,830,108.93
5. Step 5: Solve for x
   x = 2,830,108.93/1,439.82
6. Step 6: Final answer
   x = 1,965.60