Finding the Fourth Proportional to 80,215.78, 120,288.13 and 42,768.87

Step by Step Solution

1. Step 1: Write the proportion equation
   80,215.78 : 120,288.13 = 42,768.87 : x
2. Step 2: Convert to fraction form
   80,215.78/120,288.13 = 42,768.87/x
3. Step 3: Cross multiply
   80,215.78x = 120,288.13 × 42,768.87
4. Step 4: Simplify right side
   80,215.78x = 5,144,587,394.51
5. Step 5: Solve for x
   x = 5,144,587,394.51/80,215.78
6. Step 6: Final answer
   x = 64,134.36