Finding the Fourth Proportional to 86,408.78, 129,624.71 and 42,029.69

Step by Step Solution

1. Step 1: Write the proportion equation
   86,408.78 : 129,624.71 = 42,029.69 : x
2. Step 2: Convert to fraction form
   86,408.78/129,624.71 = 42,029.69/x
3. Step 3: Cross multiply
   86,408.78x = 129,624.71 × 42,029.69
4. Step 4: Simplify right side
   86,408.78x = 5,448,085,519.37
5. Step 5: Solve for x
   x = 5,448,085,519.37/86,408.78
6. Step 6: Final answer
   x = 63,050.14