Finding the Fourth Proportional to 90,212.09, 135,228.83 and 42,743.25

Step by Step Solution

1. Step 1: Write the proportion equation
   90,212.09 : 135,228.83 = 42,743.25 : x
2. Step 2: Convert to fraction form
   90,212.09/135,228.83 = 42,743.25/x
3. Step 3: Cross multiply
   90,212.09x = 135,228.83 × 42,743.25
4. Step 4: Simplify right side
   90,212.09x = 5,780,119,474.18
5. Step 5: Solve for x
   x = 5,780,119,474.18/90,212.09
6. Step 6: Final answer
   x = 64,072.56