Finding the Fourth Proportional to 51,036.92, 70,434.72 and 28,380

Step by Step Solution

1. Step 1: Write the proportion equation
   51,036.92 : 70,434.72 = 28,380 : x
2. Step 2: Convert to fraction form
   51,036.92/70,434.72 = 28,380/x
3. Step 3: Cross multiply
   51,036.92x = 70,434.72 × 28,380
4. Step 4: Simplify right side
   51,036.92x = 1,998,937,353.60
5. Step 5: Solve for x
   x = 1,998,937,353.60/51,036.92
6. Step 6: Final answer
   x = 39,166.50