Finding the Fourth Proportional to 78,217.60, 107,940.88 and 42,408.16

Step by Step Solution

1. Step 1: Write the proportion equation
   78,217.60 : 107,940.88 = 42,408.16 : x
2. Step 2: Convert to fraction form
   78,217.60/107,940.88 = 42,408.16/x
3. Step 3: Cross multiply
   78,217.60x = 107,940.88 × 42,408.16
4. Step 4: Simplify right side
   78,217.60x = 4,577,574,109.58
5. Step 5: Solve for x
   x = 4,577,574,109.58/78,217.60
6. Step 6: Final answer
   x = 58,523.58