Finding the Fourth Proportional to 65,949.74, 90,939.71 and 64,565.86

Step by Step Solution

1. Step 1: Write the proportion equation
   65,949.74 : 90,939.71 = 64,565.86 : x
2. Step 2: Convert to fraction form
   65,949.74/90,939.71 = 64,565.86/x
3. Step 3: Cross multiply
   65,949.74x = 90,939.71 × 64,565.86
4. Step 4: Simplify right side
   65,949.74x = 5,871,600,688.88
5. Step 5: Solve for x
   x = 5,871,600,688.88/65,949.74
6. Step 6: Final answer
   x = 89,031.44