Finding the Fourth Proportional to 20,783.28, 31,173.98 and 7,634.69

Step by Step Solution

1. Step 1: Write the proportion equation
   20,783.28 : 31,173.98 = 7,634.69 : x
2. Step 2: Convert to fraction form
   20,783.28/31,173.98 = 7,634.69/x
3. Step 3: Cross multiply
   20,783.28x = 31,173.98 × 7,634.69
4. Step 4: Simplify right side
   20,783.28x = 238,003,639.17
5. Step 5: Solve for x
   x = 238,003,639.17/20,783.28
6. Step 6: Final answer
   x = 11,451.69