Finding the Fourth Proportional to 37,285.78, 51,454.35 and 20,518.78

Step by Step Solution

1. Step 1: Write the proportion equation
   37,285.78 : 51,454.35 = 20,518.78 : x
2. Step 2: Convert to fraction form
   37,285.78/51,454.35 = 20,518.78/x
3. Step 3: Cross multiply
   37,285.78x = 51,454.35 × 20,518.78
4. Step 4: Simplify right side
   37,285.78x = 1,055,780,487.69
5. Step 5: Solve for x
   x = 1,055,780,487.69/37,285.78
6. Step 6: Final answer
   x = 28,315.90