Finding the Fourth Proportional to 72,682.40, 109,036.56 and 20,090.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,682.40 : 109,036.56 = 20,090.72 : x
2. Step 2: Convert to fraction form
   72,682.40/109,036.56 = 20,090.72/x
3. Step 3: Cross multiply
   72,682.40x = 109,036.56 × 20,090.72
4. Step 4: Simplify right side
   72,682.40x = 2,190,622,996.72
5. Step 5: Solve for x
   x = 2,190,622,996.72/72,682.40
6. Step 6: Final answer
   x = 30,139.66