Finding the Fourth Proportional to 70,608.91, 105,881.06 and 42,158.78

Step by Step Solution

1. Step 1: Write the proportion equation
   70,608.91 : 105,881.06 = 42,158.78 : x
2. Step 2: Convert to fraction form
   70,608.91/105,881.06 = 42,158.78/x
3. Step 3: Cross multiply
   70,608.91x = 105,881.06 × 42,158.78
4. Step 4: Simplify right side
   70,608.91x = 4,463,815,890.70
5. Step 5: Solve for x
   x = 4,463,815,890.70/70,608.91
6. Step 6: Final answer
   x = 63,218.88