Finding the Fourth Proportional to 90,256.43, 135,295.40 and 42,788.27

Step by Step Solution

1. Step 1: Write the proportion equation
   90,256.43 : 135,295.40 = 42,788.27 : x
2. Step 2: Convert to fraction form
   90,256.43/135,295.40 = 42,788.27/x
3. Step 3: Cross multiply
   90,256.43x = 135,295.40 × 42,788.27
4. Step 4: Simplify right side
   90,256.43x = 5,789,055,214.54
5. Step 5: Solve for x
   x = 5,789,055,214.54/90,256.43
6. Step 6: Final answer
   x = 64,140.09