Finding the Fourth Proportional to 105,743.26, 145,925.31 and 65,449

Step by Step Solution

1. Step 1: Write the proportion equation
   105,743.26 : 145,925.31 = 65,449 : x
2. Step 2: Convert to fraction form
   105,743.26/145,925.31 = 65,449/x
3. Step 3: Cross multiply
   105,743.26x = 145,925.31 × 65,449
4. Step 4: Simplify right side
   105,743.26x = 9,550,665,614.19
5. Step 5: Solve for x
   x = 9,550,665,614.19/105,743.26
6. Step 6: Final answer
   x = 90,319.38