Finding the Fourth Proportional to 65,287.16, 89,509.52 and 64,106.18

Step by Step Solution

1. Step 1: Write the proportion equation
   65,287.16 : 89,509.52 = 64,106.18 : x
2. Step 2: Convert to fraction form
   65,287.16/89,509.52 = 64,106.18/x
3. Step 3: Cross multiply
   65,287.16x = 89,509.52 × 64,106.18
4. Step 4: Simplify right side
   65,287.16x = 5,738,112,632.76
5. Step 5: Solve for x
   x = 5,738,112,632.76/65,287.16
6. Step 6: Final answer
   x = 87,890.38