Finding the Fourth Proportional to 51,085.72, 70,498.98 and 28,729.72

Step by Step Solution

1. Step 1: Write the proportion equation
   51,085.72 : 70,498.98 = 28,729.72 : x
2. Step 2: Convert to fraction form
   51,085.72/70,498.98 = 28,729.72/x
3. Step 3: Cross multiply
   51,085.72x = 70,498.98 × 28,729.72
4. Step 4: Simplify right side
   51,085.72x = 2,025,415,955.69
5. Step 5: Solve for x
   x = 2,025,415,955.69/51,085.72
6. Step 6: Final answer
   x = 39,647.40