Finding the Fourth Proportional to 91,786.81, 126,429.78 and 64,883.05

Step by Step Solution

1. Step 1: Write the proportion equation
   91,786.81 : 126,429.78 = 64,883.05 : x
2. Step 2: Convert to fraction form
   91,786.81/126,429.78 = 64,883.05/x
3. Step 3: Cross multiply
   91,786.81x = 126,429.78 × 64,883.05
4. Step 4: Simplify right side
   91,786.81x = 8,203,149,737.23
5. Step 5: Solve for x
   x = 8,203,149,737.23/91,786.81
6. Step 6: Final answer
   x = 89,371.77