Finding the Fourth Proportional to 51,429.63, 70,978.78 and 28,774.36

Step by Step Solution

1. Step 1: Write the proportion equation
   51,429.63 : 70,978.78 = 28,774.36 : x
2. Step 2: Convert to fraction form
   51,429.63/70,978.78 = 28,774.36/x
3. Step 3: Cross multiply
   51,429.63x = 70,978.78 × 28,774.36
4. Step 4: Simplify right side
   51,429.63x = 2,042,369,292.40
5. Step 5: Solve for x
   x = 2,042,369,292.40/51,429.63
6. Step 6: Final answer
   x = 39,711.92