Finding the Fourth Proportional to 65,287.66, 89,510.20 and 64,106.68

Step by Step Solution

1. Step 1: Write the proportion equation
   65,287.66 : 89,510.20 = 64,106.68 : x
2. Step 2: Convert to fraction form
   65,287.66/89,510.20 = 64,106.68/x
3. Step 3: Cross multiply
   65,287.66x = 89,510.20 × 64,106.68
4. Step 4: Simplify right side
   65,287.66x = 5,738,201,300.59
5. Step 5: Solve for x
   x = 5,738,201,300.59/65,287.66
6. Step 6: Final answer
   x = 87,891.06