Finding the Fourth Proportional to 78,028.41, 107,678.43 and 42,217.63

Step by Step Solution

1. Step 1: Write the proportion equation
   78,028.41 : 107,678.43 = 42,217.63 : x
2. Step 2: Convert to fraction form
   78,028.41/107,678.43 = 42,217.63/x
3. Step 3: Cross multiply
   78,028.41x = 107,678.43 × 42,217.63
4. Step 4: Simplify right side
   78,028.41x = 4,545,928,116.72
5. Step 5: Solve for x
   x = 4,545,928,116.72/78,028.41
6. Step 6: Final answer
   x = 58,259.91