Finding the Fourth Proportional to 78,042.02, 107,744.38 and 51,231.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,042.02 : 107,744.38 = 51,231.42 : x
2. Step 2: Convert to fraction form
   78,042.02/107,744.38 = 51,231.42/x
3. Step 3: Cross multiply
   78,042.02x = 107,744.38 × 51,231.42
4. Step 4: Simplify right side
   78,042.02x = 5,519,897,456.34
5. Step 5: Solve for x
   x = 5,519,897,456.34/78,042.02
6. Step 6: Final answer
   x = 70,729.82