Finding the Fourth Proportional to 105,912.78, 158,934.78 and 61,560.42

Step by Step Solution

1. Step 1: Write the proportion equation
   105,912.78 : 158,934.78 = 61,560.42 : x
2. Step 2: Convert to fraction form
   105,912.78/158,934.78 = 61,560.42/x
3. Step 3: Cross multiply
   105,912.78x = 158,934.78 × 61,560.42
4. Step 4: Simplify right side
   105,912.78x = 9,784,091,809.41
5. Step 5: Solve for x
   x = 9,784,091,809.41/105,912.78
6. Step 6: Final answer
   x = 92,378.76