Finding the Fourth Proportional to 65,276.69, 90,081.72 and 39,783.02

Step by Step Solution

1. Step 1: Write the proportion equation
   65,276.69 : 90,081.72 = 39,783.02 : x
2. Step 2: Convert to fraction form
   65,276.69/90,081.72 = 39,783.02/x
3. Step 3: Cross multiply
   65,276.69x = 90,081.72 × 39,783.02
4. Step 4: Simplify right side
   65,276.69x = 3,583,722,417.99
5. Step 5: Solve for x
   x = 3,583,722,417.99/65,276.69
6. Step 6: Final answer
   x = 54,900.50