Finding the Fourth Proportional to 70,788.18, 106,150.50 and 20,850.78

Step by Step Solution

1. Step 1: Write the proportion equation
   70,788.18 : 106,150.50 = 20,850.78 : x
2. Step 2: Convert to fraction form
   70,788.18/106,150.50 = 20,850.78/x
3. Step 3: Cross multiply
   70,788.18x = 106,150.50 × 20,850.78
4. Step 4: Simplify right side
   70,788.18x = 2,213,320,722.39
5. Step 5: Solve for x
   x = 2,213,320,722.39/70,788.18
6. Step 6: Final answer
   x = 31,266.81