Finding the Fourth Proportional to 51,139.50, 70,573.59 and 28,783.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,139.50 : 70,573.59 = 28,783.50 : x
2. Step 2: Convert to fraction form
   51,139.50/70,573.59 = 28,783.50/x
3. Step 3: Cross multiply
   51,139.50x = 70,573.59 × 28,783.50
4. Step 4: Simplify right side
   51,139.50x = 2,031,354,927.77
5. Step 5: Solve for x
   x = 2,031,354,927.77/51,139.50
6. Step 6: Final answer
   x = 39,721.84