Finding the Fourth Proportional to 37,680.72, 51,996.96 and 20,913.60

Step by Step Solution

1. Step 1: Write the proportion equation
   37,680.72 : 51,996.96 = 20,913.60 : x
2. Step 2: Convert to fraction form
   37,680.72/51,996.96 = 20,913.60/x
3. Step 3: Cross multiply
   37,680.72x = 51,996.96 × 20,913.60
4. Step 4: Simplify right side
   37,680.72x = 1,087,443,622.66
5. Step 5: Solve for x
   x = 1,087,443,622.66/37,680.72
6. Step 6: Final answer
   x = 28,859.42