Finding the Fourth Proportional to 52,279.89, 72,145.21 and 28,406.74

Step by Step Solution

1. Step 1: Write the proportion equation
   52,279.89 : 72,145.21 = 28,406.74 : x
2. Step 2: Convert to fraction form
   52,279.89/72,145.21 = 28,406.74/x
3. Step 3: Cross multiply
   52,279.89x = 72,145.21 × 28,406.74
4. Step 4: Simplify right side
   52,279.89x = 2,049,410,222.72
5. Step 5: Solve for x
   x = 2,049,410,222.72/52,279.89
6. Step 6: Final answer
   x = 39,200.74