Finding the Fourth Proportional to 52,640.40, 72,643.35 and 28,766.55

Step by Step Solution

1. Step 1: Write the proportion equation
   52,640.40 : 72,643.35 = 28,766.55 : x
2. Step 2: Convert to fraction form
   52,640.40/72,643.35 = 28,766.55/x
3. Step 3: Cross multiply
   52,640.40x = 72,643.35 × 28,766.55
4. Step 4: Simplify right side
   52,640.40x = 2,089,698,559.94
5. Step 5: Solve for x
   x = 2,089,698,559.94/52,640.40
6. Step 6: Final answer
   x = 39,697.62