Finding the Fourth Proportional to 72,138.05, 108,173.01 and 42,160.88

Step by Step Solution

1. Step 1: Write the proportion equation
   72,138.05 : 108,173.01 = 42,160.88 : x
2. Step 2: Convert to fraction form
   72,138.05/108,173.01 = 42,160.88/x
3. Step 3: Cross multiply
   72,138.05x = 108,173.01 × 42,160.88
4. Step 4: Simplify right side
   72,138.05x = 4,560,669,564.28
5. Step 5: Solve for x
   x = 4,560,669,564.28/72,138.05
6. Step 6: Final answer
   x = 63,221.42