Finding the Fourth Proportional to 52,780.42, 72,836.25 and 28,907.09

Step by Step Solution

1. Step 1: Write the proportion equation
   52,780.42 : 72,836.25 = 28,907.09 : x
2. Step 2: Convert to fraction form
   52,780.42/72,836.25 = 28,907.09/x
3. Step 3: Cross multiply
   52,780.42x = 72,836.25 × 28,907.09
4. Step 4: Simplify right side
   52,780.42x = 2,105,483,834.57
5. Step 5: Solve for x
   x = 2,105,483,834.57/52,780.42
6. Step 6: Final answer
   x = 39,891.38