Finding the Fourth Proportional to 64,788.80, 89,275.32 and 49,680.68

Step by Step Solution

1. Step 1: Write the proportion equation
   64,788.80 : 89,275.32 = 49,680.68 : x
2. Step 2: Convert to fraction form
   64,788.80/89,275.32 = 49,680.68/x
3. Step 3: Cross multiply
   64,788.80x = 89,275.32 × 49,680.68
4. Step 4: Simplify right side
   64,788.80x = 4,435,258,604.82
5. Step 5: Solve for x
   x = 4,435,258,604.82/64,788.80
6. Step 6: Final answer
   x = 68,457.18