Finding the Fourth Proportional to 90,218.09, 135,237.83 and 42,749.25

Step by Step Solution

1. Step 1: Write the proportion equation
   90,218.09 : 135,237.83 = 42,749.25 : x
2. Step 2: Convert to fraction form
   90,218.09/135,237.83 = 42,749.25/x
3. Step 3: Cross multiply
   90,218.09x = 135,237.83 × 42,749.25
4. Step 4: Simplify right side
   90,218.09x = 5,781,315,590.38
5. Step 5: Solve for x
   x = 5,781,315,590.38/90,218.09
6. Step 6: Final answer
   x = 64,081.56