Finding the Fourth Proportional to 65,262.68, 90,105.83 and 50,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   65,262.68 : 90,105.83 = 50,128.28 : x
2. Step 2: Convert to fraction form
   65,262.68/90,105.83 = 50,128.28/x
3. Step 3: Cross multiply
   65,262.68x = 90,105.83 × 50,128.28
4. Step 4: Simplify right side
   65,262.68x = 4,516,850,275.87
5. Step 5: Solve for x
   x = 4,516,850,275.87/65,262.68
6. Step 6: Final answer
   x = 69,210.31