Finding the Fourth Proportional to 78,119.71, 107,805.16 and 42,309.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,119.71 : 107,805.16 = 42,309.72 : x
2. Step 2: Convert to fraction form
   78,119.71/107,805.16 = 42,309.72/x
3. Step 3: Cross multiply
   78,119.71x = 107,805.16 × 42,309.72
4. Step 4: Simplify right side
   78,119.71x = 4,561,205,383.58
5. Step 5: Solve for x
   x = 4,561,205,383.58/78,119.71
6. Step 6: Final answer
   x = 58,387.39