Finding the Fourth Proportional to 70,604.76, 105,921.72 and 20,686.48

Step by Step Solution

1. Step 1: Write the proportion equation
   70,604.76 : 105,921.72 = 20,686.48 : x
2. Step 2: Convert to fraction form
   70,604.76/105,921.72 = 20,686.48/x
3. Step 3: Cross multiply
   70,604.76x = 105,921.72 × 20,686.48
4. Step 4: Simplify right side
   70,604.76x = 2,191,147,542.35
5. Step 5: Solve for x
   x = 2,191,147,542.35/70,604.76
6. Step 6: Final answer
   x = 31,033.99