Finding the Fourth Proportional to 65,790.72, 90,785.67 and 38,928.52

Step by Step Solution

1. Step 1: Write the proportion equation
   65,790.72 : 90,785.67 = 38,928.52 : x
2. Step 2: Convert to fraction form
   65,790.72/90,785.67 = 38,928.52/x
3. Step 3: Cross multiply
   65,790.72x = 90,785.67 × 38,928.52
4. Step 4: Simplify right side
   65,790.72x = 3,534,151,867.63
5. Step 5: Solve for x
   x = 3,534,151,867.63/65,790.72
6. Step 6: Final answer
   x = 53,718.09