Finding the Fourth Proportional to 20,995.86, 28,965.15 and 12,607.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,995.86 : 28,965.15 = 12,607.50 : x
2. Step 2: Convert to fraction form
   20,995.86/28,965.15 = 12,607.50/x
3. Step 3: Cross multiply
   20,995.86x = 28,965.15 × 12,607.50
4. Step 4: Simplify right side
   20,995.86x = 365,178,128.63
5. Step 5: Solve for x
   x = 365,178,128.63/20,995.86
6. Step 6: Final answer
   x = 17,392.86