Finding the Fourth Proportional to 37,640.32, 51,939.89 and 21,729.89

Step by Step Solution

1. Step 1: Write the proportion equation
   37,640.32 : 51,939.89 = 21,729.89 : x
2. Step 2: Convert to fraction form
   37,640.32/51,939.89 = 21,729.89/x
3. Step 3: Cross multiply
   37,640.32x = 51,939.89 × 21,729.89
4. Step 4: Simplify right side
   37,640.32x = 1,128,648,096.31
5. Step 5: Solve for x
   x = 1,128,648,096.31/37,640.32
6. Step 6: Final answer
   x = 29,985.09