Finding the Fourth Proportional to 66,601.30, 91,722.69 and 65,149.78

Step by Step Solution

1. Step 1: Write the proportion equation
   66,601.30 : 91,722.69 = 65,149.78 : x
2. Step 2: Convert to fraction form
   66,601.30/91,722.69 = 65,149.78/x
3. Step 3: Cross multiply
   66,601.30x = 91,722.69 × 65,149.78
4. Step 4: Simplify right side
   66,601.30x = 5,975,713,074.51
5. Step 5: Solve for x
   x = 5,975,713,074.51/66,601.30
6. Step 6: Final answer
   x = 89,723.67