Finding the Fourth Proportional to 37,939.50, 52,356.60 and 21,172.50

Step by Step Solution

1. Step 1: Write the proportion equation
   37,939.50 : 52,356.60 = 21,172.50 : x
2. Step 2: Convert to fraction form
   37,939.50/52,356.60 = 21,172.50/x
3. Step 3: Cross multiply
   37,939.50x = 52,356.60 × 21,172.50
4. Step 4: Simplify right side
   37,939.50x = 1,108,520,113.50
5. Step 5: Solve for x
   x = 1,108,520,113.50/37,939.50
6. Step 6: Final answer
   x = 29,218.10