Finding the Fourth Proportional to 51,356.40, 70,870.50 and 28,695.57

Step by Step Solution

1. Step 1: Write the proportion equation
   51,356.40 : 70,870.50 = 28,695.57 : x
2. Step 2: Convert to fraction form
   51,356.40/70,870.50 = 28,695.57/x
3. Step 3: Cross multiply
   51,356.40x = 70,870.50 × 28,695.57
4. Step 4: Simplify right side
   51,356.40x = 2,033,669,393.69
5. Step 5: Solve for x
   x = 2,033,669,393.69/51,356.40
6. Step 6: Final answer
   x = 39,599.15