Finding the Fourth Proportional to 89,765.46, 123,819.57 and 64,221.30

Step by Step Solution

1. Step 1: Write the proportion equation
   89,765.46 : 123,819.57 = 64,221.30 : x
2. Step 2: Convert to fraction form
   89,765.46/123,819.57 = 64,221.30/x
3. Step 3: Cross multiply
   89,765.46x = 123,819.57 × 64,221.30
4. Step 4: Simplify right side
   89,765.46x = 7,951,853,750.84
5. Step 5: Solve for x
   x = 7,951,853,750.84/89,765.46
6. Step 6: Final answer
   x = 88,584.78