Finding the Fourth Proportional to 51,172.50, 70,618.59 and 28,816.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,172.50 : 70,618.59 = 28,816.50 : x
2. Step 2: Convert to fraction form
   51,172.50/70,618.59 = 28,816.50/x
3. Step 3: Cross multiply
   51,172.50x = 70,618.59 × 28,816.50
4. Step 4: Simplify right side
   51,172.50x = 2,034,980,598.74
5. Step 5: Solve for x
   x = 2,034,980,598.74/51,172.50
6. Step 6: Final answer
   x = 39,767.07