Finding the Fourth Proportional to 52,780.15, 72,836.60 and 28,906.88

Step by Step Solution

1. Step 1: Write the proportion equation
   52,780.15 : 72,836.60 = 28,906.88 : x
2. Step 2: Convert to fraction form
   52,780.15/72,836.60 = 28,906.88/x
3. Step 3: Cross multiply
   52,780.15x = 72,836.60 × 28,906.88
4. Step 4: Simplify right side
   52,780.15x = 2,105,479,001.77
5. Step 5: Solve for x
   x = 2,105,479,001.77/52,780.15
6. Step 6: Final answer
   x = 39,891.50