Finding the Fourth Proportional to 51,578.50, 77,402.31 and 18,746.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,578.50 : 77,402.31 = 18,746.50 : x
2. Step 2: Convert to fraction form
   51,578.50/77,402.31 = 18,746.50/x
3. Step 3: Cross multiply
   51,578.50x = 77,402.31 × 18,746.50
4. Step 4: Simplify right side
   51,578.50x = 1,451,022,404.42
5. Step 5: Solve for x
   x = 1,451,022,404.42/51,578.50
6. Step 6: Final answer
   x = 28,132.31