Finding the Fourth Proportional to 37,431, 51,654.78 and 20,664.12

Step by Step Solution

1. Step 1: Write the proportion equation
   37,431 : 51,654.78 = 20,664.12 : x
2. Step 2: Convert to fraction form
   37,431/51,654.78 = 20,664.12/x
3. Step 3: Cross multiply
   37,431x = 51,654.78 × 20,664.12
4. Step 4: Simplify right side
   37,431x = 1,067,400,572.49
5. Step 5: Solve for x
   x = 1,067,400,572.49/37,431
6. Step 6: Final answer
   x = 28,516.49