Finding the Fourth Proportional to 105,301.92, 157,996.08 and 42,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,301.92 : 157,996.08 = 42,978.72 : x
2. Step 2: Convert to fraction form
   105,301.92/157,996.08 = 42,978.72/x
3. Step 3: Cross multiply
   105,301.92x = 157,996.08 × 42,978.72
4. Step 4: Simplify right side
   105,301.92x = 6,790,469,283.42
5. Step 5: Solve for x
   x = 6,790,469,283.42/105,301.92
6. Step 6: Final answer
   x = 64,485.71