Finding the Fourth Proportional to 68,799.78, 94,933.98 and 40,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   68,799.78 : 94,933.98 = 40,128.12 : x
2. Step 2: Convert to fraction form
   68,799.78/94,933.98 = 40,128.12/x
3. Step 3: Cross multiply
   68,799.78x = 94,933.98 × 40,128.12
4. Step 4: Simplify right side
   68,799.78x = 3,809,522,141.52
5. Step 5: Solve for x
   x = 3,809,522,141.52/68,799.78
6. Step 6: Final answer
   x = 55,371.14