Finding the Fourth Proportional to 52,639.86, 72,641.82 and 28,766.64

Step by Step Solution

1. Step 1: Write the proportion equation
   52,639.86 : 72,641.82 = 28,766.64 : x
2. Step 2: Convert to fraction form
   52,639.86/72,641.82 = 28,766.64/x
3. Step 3: Cross multiply
   52,639.86x = 72,641.82 × 28,766.64
4. Step 4: Simplify right side
   52,639.86x = 2,089,661,084.88
5. Step 5: Solve for x
   x = 2,089,661,084.88/52,639.86
6. Step 6: Final answer
   x = 39,697.31