Finding the Fourth Proportional to 20,461.98, 30,693.56 and 7,981.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,461.98 : 30,693.56 = 7,981.50 : x
2. Step 2: Convert to fraction form
   20,461.98/30,693.56 = 7,981.50/x
3. Step 3: Cross multiply
   20,461.98x = 30,693.56 × 7,981.50
4. Step 4: Simplify right side
   20,461.98x = 244,980,649.14
5. Step 5: Solve for x
   x = 244,980,649.14/20,461.98
6. Step 6: Final answer
   x = 11,972.48