Finding the Fourth Proportional to 51,085.69, 70,498.55 and 28,729.69

Step by Step Solution

1. Step 1: Write the proportion equation
   51,085.69 : 70,498.55 = 28,729.69 : x
2. Step 2: Convert to fraction form
   51,085.69/70,498.55 = 28,729.69/x
3. Step 3: Cross multiply
   51,085.69x = 70,498.55 × 28,729.69
4. Step 4: Simplify right side
   51,085.69x = 2,025,401,382.53
5. Step 5: Solve for x
   x = 2,025,401,382.53/51,085.69
6. Step 6: Final answer
   x = 39,647.14