Finding the Fourth Proportional to 37,906.30, 52,309.56 and 21,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   37,906.30 : 52,309.56 = 21,139.30 : x
2. Step 2: Convert to fraction form
   37,906.30/52,309.56 = 21,139.30/x
3. Step 3: Cross multiply
   37,906.30x = 52,309.56 × 21,139.30
4. Step 4: Simplify right side
   37,906.30x = 1,105,787,481.71
5. Step 5: Solve for x
   x = 1,105,787,481.71/37,906.30
6. Step 6: Final answer
   x = 29,171.60