Finding the Fourth Proportional to 115,638.84, 159,584.72 and 64,650.15

Step by Step Solution

1. Step 1: Write the proportion equation
   115,638.84 : 159,584.72 = 64,650.15 : x
2. Step 2: Convert to fraction form
   115,638.84/159,584.72 = 64,650.15/x
3. Step 3: Cross multiply
   115,638.84x = 159,584.72 × 64,650.15
4. Step 4: Simplify right side
   115,638.84x = 10,317,175,762.46
5. Step 5: Solve for x
   x = 10,317,175,762.46/115,638.84
6. Step 6: Final answer
   x = 89,218.95