Finding the Fourth Proportional to 52,638.72, 72,641.48 and 28,439.70

Step by Step Solution

1. Step 1: Write the proportion equation
   52,638.72 : 72,641.48 = 28,439.70 : x
2. Step 2: Convert to fraction form
   52,638.72/72,641.48 = 28,439.70/x
3. Step 3: Cross multiply
   52,638.72x = 72,641.48 × 28,439.70
4. Step 4: Simplify right side
   52,638.72x = 2,065,901,756.56
5. Step 5: Solve for x
   x = 2,065,901,756.56/52,638.72
6. Step 6: Final answer
   x = 39,246.81