Finding the Fourth Proportional to 65,919.72, 90,953.47 and 39,057.59

Step by Step Solution

1. Step 1: Write the proportion equation
   65,919.72 : 90,953.47 = 39,057.59 : x
2. Step 2: Convert to fraction form
   65,919.72/90,953.47 = 39,057.59/x
3. Step 3: Cross multiply
   65,919.72x = 90,953.47 × 39,057.59
4. Step 4: Simplify right side
   65,919.72x = 3,552,422,690.28
5. Step 5: Solve for x
   x = 3,552,422,690.28/65,919.72
6. Step 6: Final answer
   x = 53,890.14