Finding the Fourth Proportional to 52,639.04, 72,639.72 and 28,766.52

Step by Step Solution

1. Step 1: Write the proportion equation
   52,639.04 : 72,639.72 = 28,766.52 : x
2. Step 2: Convert to fraction form
   52,639.04/72,639.72 = 28,766.52/x
3. Step 3: Cross multiply
   52,639.04x = 72,639.72 × 28,766.52
4. Step 4: Simplify right side
   52,639.04x = 2,089,591,958.17
5. Step 5: Solve for x
   x = 2,089,591,958.17/52,639.04
6. Step 6: Final answer
   x = 39,696.62