Finding the Fourth Proportional to 65,688.58, 89,993.69 and 63,228.57

Step by Step Solution

1. Step 1: Write the proportion equation
   65,688.58 : 89,993.69 = 63,228.57 : x
2. Step 2: Convert to fraction form
   65,688.58/89,993.69 = 63,228.57/x
3. Step 3: Cross multiply
   65,688.58x = 89,993.69 × 63,228.57
4. Step 4: Simplify right side
   65,688.58x = 5,690,172,327.72
5. Step 5: Solve for x
   x = 5,690,172,327.72/65,688.58
6. Step 6: Final answer
   x = 86,623.46