Finding the Fourth Proportional to 20,767.96, 28,663.50 and 12,385

Step by Step Solution

1. Step 1: Write the proportion equation
   20,767.96 : 28,663.50 = 12,385 : x
2. Step 2: Convert to fraction form
   20,767.96/28,663.50 = 12,385/x
3. Step 3: Cross multiply
   20,767.96x = 28,663.50 × 12,385
4. Step 4: Simplify right side
   20,767.96x = 354,997,447.50
5. Step 5: Solve for x
   x = 354,997,447.50/20,767.96
6. Step 6: Final answer
   x = 17,093.52