Finding the Fourth Proportional to 90,205.72, 135,305.78 and 42,854.89

Step by Step Solution

1. Step 1: Write the proportion equation
   90,205.72 : 135,305.78 = 42,854.89 : x
2. Step 2: Convert to fraction form
   90,205.72/135,305.78 = 42,854.89/x
3. Step 3: Cross multiply
   90,205.72x = 135,305.78 × 42,854.89
4. Step 4: Simplify right side
   90,205.72x = 5,798,514,318.26
5. Step 5: Solve for x
   x = 5,798,514,318.26/90,205.72
6. Step 6: Final answer
   x = 64,281.00