Finding the Fourth Proportional to 52,105.21, 78,157.58 and 12,662.39

Step by Step Solution

1. Step 1: Write the proportion equation
   52,105.21 : 78,157.58 = 12,662.39 : x
2. Step 2: Convert to fraction form
   52,105.21/78,157.58 = 12,662.39/x
3. Step 3: Cross multiply
   52,105.21x = 78,157.58 × 12,662.39
4. Step 4: Simplify right side
   52,105.21x = 989,661,891.50
5. Step 5: Solve for x
   x = 989,661,891.50/52,105.21
6. Step 6: Final answer
   x = 18,993.53