Finding the Fourth Proportional to 78,018.70, 107,665.82 and 42,208.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78,018.70 : 107,665.82 = 42,208.69 : x
2. Step 2: Convert to fraction form
   78,018.70/107,665.82 = 42,208.69/x
3. Step 3: Cross multiply
   78,018.70x = 107,665.82 × 42,208.69
4. Step 4: Simplify right side
   78,018.70x = 4,544,433,219.98
5. Step 5: Solve for x
   x = 4,544,433,219.98/78,018.70
6. Step 6: Final answer
   x = 58,248.00