Finding the Fourth Proportional to 65,287.24, 90,063.23 and 42,639.49

Step by Step Solution

1. Step 1: Write the proportion equation
   65,287.24 : 90,063.23 = 42,639.49 : x
2. Step 2: Convert to fraction form
   65,287.24/90,063.23 = 42,639.49/x
3. Step 3: Cross multiply
   65,287.24x = 90,063.23 × 42,639.49
4. Step 4: Simplify right side
   65,287.24x = 3,840,249,587.73
5. Step 5: Solve for x
   x = 3,840,249,587.73/65,287.24
6. Step 6: Final answer
   x = 58,820.83