Finding the Fourth Proportional to 65,399.52, 90,227.04 and 39,897.12

Step by Step Solution

1. Step 1: Write the proportion equation
   65,399.52 : 90,227.04 = 39,897.12 : x
2. Step 2: Convert to fraction form
   65,399.52/90,227.04 = 39,897.12/x
3. Step 3: Cross multiply
   65,399.52x = 90,227.04 × 39,897.12
4. Step 4: Simplify right side
   65,399.52x = 3,599,799,042.12
5. Step 5: Solve for x
   x = 3,599,799,042.12/65,399.52
6. Step 6: Final answer
   x = 55,043.20