Finding the Fourth Proportional to 78,221.70, 107,945.73 and 42,411.60

Step by Step Solution

1. Step 1: Write the proportion equation
   78,221.70 : 107,945.73 = 42,411.60 : x
2. Step 2: Convert to fraction form
   78,221.70/107,945.73 = 42,411.60/x
3. Step 3: Cross multiply
   78,221.70x = 107,945.73 × 42,411.60
4. Step 4: Simplify right side
   78,221.70x = 4,578,151,122.47
5. Step 5: Solve for x
   x = 4,578,151,122.47/78,221.70
6. Step 6: Final answer
   x = 58,527.89