Finding the Fourth Proportional to 20,783.59, 31,179.45 and 7,636.06

Step by Step Solution

1. Step 1: Write the proportion equation
   20,783.59 : 31,179.45 = 7,636.06 : x
2. Step 2: Convert to fraction form
   20,783.59/31,179.45 = 7,636.06/x
3. Step 3: Cross multiply
   20,783.59x = 31,179.45 × 7,636.06
4. Step 4: Simplify right side
   20,783.59x = 238,088,150.97
5. Step 5: Solve for x
   x = 238,088,150.97/20,783.59
6. Step 6: Final answer
   x = 11,455.58