Finding the Fourth Proportional to 51,145.60, 70,581.72 and 28,789.60

Step by Step Solution

1. Step 1: Write the proportion equation
   51,145.60 : 70,581.72 = 28,789.60 : x
2. Step 2: Convert to fraction form
   51,145.60/70,581.72 = 28,789.60/x
3. Step 3: Cross multiply
   51,145.60x = 70,581.72 × 28,789.60
4. Step 4: Simplify right side
   51,145.60x = 2,032,019,486.11
5. Step 5: Solve for x
   x = 2,032,019,486.11/51,145.60
6. Step 6: Final answer
   x = 39,730.09