Finding the Fourth Proportional to 60,978.78, 91,468.17 and 40,197.42

Step by Step Solution

1. Step 1: Write the proportion equation
   60,978.78 : 91,468.17 = 40,197.42 : x
2. Step 2: Convert to fraction form
   60,978.78/91,468.17 = 40,197.42/x
3. Step 3: Cross multiply
   60,978.78x = 91,468.17 × 40,197.42
4. Step 4: Simplify right side
   60,978.78x = 3,676,783,952.38
5. Step 5: Solve for x
   x = 3,676,783,952.38/60,978.78
6. Step 6: Final answer
   x = 60,296.13