Finding the Fourth Proportional to 86,058.72, 129,124.56 and 79,169.76

Step by Step Solution

1. Step 1: Write the proportion equation
   86,058.72 : 129,124.56 = 79,169.76 : x
2. Step 2: Convert to fraction form
   86,058.72/129,124.56 = 79,169.76/x
3. Step 3: Cross multiply
   86,058.72x = 129,124.56 × 79,169.76
4. Step 4: Simplify right side
   86,058.72x = 10,222,760,425.31
5. Step 5: Solve for x
   x = 10,222,760,425.31/86,058.72
6. Step 6: Final answer
   x = 118,788.20