Finding the Fourth Proportional to 67,128.48, 92,586.96 and 64,150.56

Step by Step Solution

1. Step 1: Write the proportion equation
   67,128.48 : 92,586.96 = 64,150.56 : x
2. Step 2: Convert to fraction form
   67,128.48/92,586.96 = 64,150.56/x
3. Step 3: Cross multiply
   67,128.48x = 92,586.96 × 64,150.56
4. Step 4: Simplify right side
   67,128.48x = 5,939,505,332.70
5. Step 5: Solve for x
   x = 5,939,505,332.70/67,128.48
6. Step 6: Final answer
   x = 88,479.66