Finding the Fourth Proportional to 52,780.34, 72,836.86 and 28,907.07

Step by Step Solution

1. Step 1: Write the proportion equation
   52,780.34 : 72,836.86 = 28,907.07 : x
2. Step 2: Convert to fraction form
   52,780.34/72,836.86 = 28,907.07/x
3. Step 3: Cross multiply
   52,780.34x = 72,836.86 × 28,907.07
4. Step 4: Simplify right side
   52,780.34x = 2,105,500,138.33
5. Step 5: Solve for x
   x = 2,105,500,138.33/52,780.34
6. Step 6: Final answer
   x = 39,891.75