Finding the Fourth Proportional to 75,789.72, 104,592.78 and 42,255

Step by Step Solution

1. Step 1: Write the proportion equation
   75,789.72 : 104,592.78 = 42,255 : x
2. Step 2: Convert to fraction form
   75,789.72/104,592.78 = 42,255/x
3. Step 3: Cross multiply
   75,789.72x = 104,592.78 × 42,255
4. Step 4: Simplify right side
   75,789.72x = 4,419,567,918.90
5. Step 5: Solve for x
   x = 4,419,567,918.90/75,789.72
6. Step 6: Final answer
   x = 58,313.55