Finding the Fourth Proportional to 65,864.48, 90,870.67 and 42,883.80

Step by Step Solution

1. Step 1: Write the proportion equation
   65,864.48 : 90,870.67 = 42,883.80 : x
2. Step 2: Convert to fraction form
   65,864.48/90,870.67 = 42,883.80/x
3. Step 3: Cross multiply
   65,864.48x = 90,870.67 × 42,883.80
4. Step 4: Simplify right side
   65,864.48x = 3,896,879,620.91
5. Step 5: Solve for x
   x = 3,896,879,620.91/65,864.48
6. Step 6: Final answer
   x = 59,165.12