Finding the Fourth Proportional to 90,203.72, 135,302.78 and 42,852.89

Step by Step Solution

1. Step 1: Write the proportion equation
   90,203.72 : 135,302.78 = 42,852.89 : x
2. Step 2: Convert to fraction form
   90,203.72/135,302.78 = 42,852.89/x
3. Step 3: Cross multiply
   90,203.72x = 135,302.78 × 42,852.89
4. Step 4: Simplify right side
   90,203.72x = 5,798,115,148.03
5. Step 5: Solve for x
   x = 5,798,115,148.03/90,203.72
6. Step 6: Final answer
   x = 64,278.00