Finding the Fourth Proportional to 37,128.72, 51,237.72 and 21,213.12

Step by Step Solution

1. Step 1: Write the proportion equation
   37,128.72 : 51,237.72 = 21,213.12 : x
2. Step 2: Convert to fraction form
   37,128.72/51,237.72 = 21,213.12/x
3. Step 3: Cross multiply
   37,128.72x = 51,237.72 × 21,213.12
4. Step 4: Simplify right side
   37,128.72x = 1,086,911,902.89
5. Step 5: Solve for x
   x = 1,086,911,902.89/37,128.72
6. Step 6: Final answer
   x = 29,274.15