Finding the Fourth Proportional to 120,216.99, 165,899.43 and 65,769.60

Step by Step Solution

1. Step 1: Write the proportion equation
   120,216.99 : 165,899.43 = 65,769.60 : x
2. Step 2: Convert to fraction form
   120,216.99/165,899.43 = 65,769.60/x
3. Step 3: Cross multiply
   120,216.99x = 165,899.43 × 65,769.60
4. Step 4: Simplify right side
   120,216.99x = 10,911,139,151.33
5. Step 5: Solve for x
   x = 10,911,139,151.33/120,216.99
6. Step 6: Final answer
   x = 90,762.04