Finding the Fourth Proportional to 37,638.81, 51,942.06 and 21,720.29

Step by Step Solution

1. Step 1: Write the proportion equation
   37,638.81 : 51,942.06 = 21,720.29 : x
2. Step 2: Convert to fraction form
   37,638.81/51,942.06 = 21,720.29/x
3. Step 3: Cross multiply
   37,638.81x = 51,942.06 × 21,720.29
4. Step 4: Simplify right side
   37,638.81x = 1,128,196,346.69
5. Step 5: Solve for x
   x = 1,128,196,346.69/37,638.81
6. Step 6: Final answer
   x = 29,974.28