Finding the Fourth Proportional to 65,061.81, 89,780.31 and 39,564.66

Step by Step Solution

1. Step 1: Write the proportion equation
   65,061.81 : 89,780.31 = 39,564.66 : x
2. Step 2: Convert to fraction form
   65,061.81/89,780.31 = 39,564.66/x
3. Step 3: Cross multiply
   65,061.81x = 89,780.31 × 39,564.66
4. Step 4: Simplify right side
   65,061.81x = 3,552,126,990.94
5. Step 5: Solve for x
   x = 3,552,126,990.94/65,061.81
6. Step 6: Final answer
   x = 54,596.19