Finding the Fourth Proportional to 65,184.72, 89,939.32 and 39,690.80

Step by Step Solution

1. Step 1: Write the proportion equation
   65,184.72 : 89,939.32 = 39,690.80 : x
2. Step 2: Convert to fraction form
   65,184.72/89,939.32 = 39,690.80/x
3. Step 3: Cross multiply
   65,184.72x = 89,939.32 × 39,690.80
4. Step 4: Simplify right side
   65,184.72x = 3,569,763,562.26
5. Step 5: Solve for x
   x = 3,569,763,562.26/65,184.72
6. Step 6: Final answer
   x = 54,763.81