Finding the Fourth Proportional to 28,339.99, 42,516.06 and 8,620.15

Step by Step Solution

1. Step 1: Write the proportion equation
   28,339.99 : 42,516.06 = 8,620.15 : x
2. Step 2: Convert to fraction form
   28,339.99/42,516.06 = 8,620.15/x
3. Step 3: Cross multiply
   28,339.99x = 42,516.06 × 8,620.15
4. Step 4: Simplify right side
   28,339.99x = 366,494,814.61
5. Step 5: Solve for x
   x = 366,494,814.61/28,339.99
6. Step 6: Final answer
   x = 12,932.07