Finding the Fourth Proportional to 65,288.27, 90,064.65 and 42,640.53

Step by Step Solution

1. Step 1: Write the proportion equation
   65,288.27 : 90,064.65 = 42,640.53 : x
2. Step 2: Convert to fraction form
   65,288.27/90,064.65 = 42,640.53/x
3. Step 3: Cross multiply
   65,288.27x = 90,064.65 × 42,640.53
4. Step 4: Simplify right side
   65,288.27x = 3,840,404,410.26
5. Step 5: Solve for x
   x = 3,840,404,410.26/65,288.27
6. Step 6: Final answer
   x = 58,822.27