Finding the Fourth Proportional to 52,685.10, 72,705.18 and 28,811.57

Step by Step Solution

1. Step 1: Write the proportion equation
   52,685.10 : 72,705.18 = 28,811.57 : x
2. Step 2: Convert to fraction form
   52,685.10/72,705.18 = 28,811.57/x
3. Step 3: Cross multiply
   52,685.10x = 72,705.18 × 28,811.57
4. Step 4: Simplify right side
   52,685.10x = 2,094,750,019.41
5. Step 5: Solve for x
   x = 2,094,750,019.41/52,685.10
6. Step 6: Final answer
   x = 39,759.82