Finding the Fourth Proportional to 64,708.05, 89,345.76 and 63,674.70

Step by Step Solution

1. Step 1: Write the proportion equation
   64,708.05 : 89,345.76 = 63,674.70 : x
2. Step 2: Convert to fraction form
   64,708.05/89,345.76 = 63,674.70/x
3. Step 3: Cross multiply
   64,708.05x = 89,345.76 × 63,674.70
4. Step 4: Simplify right side
   64,708.05x = 5,689,064,464.27
5. Step 5: Solve for x
   x = 5,689,064,464.27/64,708.05
6. Step 6: Final answer
   x = 87,918.96