Finding the Fourth Proportional to 90,202.72, 135,301.28 and 42,851.89

Step by Step Solution

1. Step 1: Write the proportion equation
   90,202.72 : 135,301.28 = 42,851.89 : x
2. Step 2: Convert to fraction form
   90,202.72/135,301.28 = 42,851.89/x
3. Step 3: Cross multiply
   90,202.72x = 135,301.28 × 42,851.89
4. Step 4: Simplify right side
   90,202.72x = 5,797,914,890.91
5. Step 5: Solve for x
   x = 5,797,914,890.91/90,202.72
6. Step 6: Final answer
   x = 64,276.50