Finding the Fourth Proportional to 73,842.78, 101,908.50 and 42,021.90

Step by Step Solution

1. Step 1: Write the proportion equation
   73,842.78 : 101,908.50 = 42,021.90 : x
2. Step 2: Convert to fraction form
   73,842.78/101,908.50 = 42,021.90/x
3. Step 3: Cross multiply
   73,842.78x = 101,908.50 × 42,021.90
4. Step 4: Simplify right side
   73,842.78x = 4,282,388,796.15
5. Step 5: Solve for x
   x = 4,282,388,796.15/73,842.78
6. Step 6: Final answer
   x = 57,993.33