Finding the Fourth Proportional to 78,221.88, 107,945.19 and 42,411.78

Step by Step Solution

1. Step 1: Write the proportion equation
   78,221.88 : 107,945.19 = 42,411.78 : x
2. Step 2: Convert to fraction form
   78,221.88/107,945.19 = 42,411.78/x
3. Step 3: Cross multiply
   78,221.88x = 107,945.19 × 42,411.78
4. Step 4: Simplify right side
   78,221.88x = 4,578,147,650.34
5. Step 5: Solve for x
   x = 4,578,147,650.34/78,221.88
6. Step 6: Final answer
   x = 58,527.71