Finding the Fourth Proportional to 60,728, 91,139.04 and 42,138.56

Step by Step Solution

1. Step 1: Write the proportion equation
   60,728 : 91,139.04 = 42,138.56 : x
2. Step 2: Convert to fraction form
   60,728/91,139.04 = 42,138.56/x
3. Step 3: Cross multiply
   60,728x = 91,139.04 × 42,138.56
4. Step 4: Simplify right side
   60,728x = 3,840,467,905.38
5. Step 5: Solve for x
   x = 3,840,467,905.38/60,728
6. Step 6: Final answer
   x = 63,240.48