Finding the Fourth Proportional to 12,212.28, 16,851.78 and 9,700.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,212.28 : 16,851.78 = 9,700.47 : x
2. Step 2: Convert to fraction form
   12,212.28/16,851.78 = 9,700.47/x
3. Step 3: Cross multiply
   12,212.28x = 16,851.78 × 9,700.47
4. Step 4: Simplify right side
   12,212.28x = 163,470,186.34
5. Step 5: Solve for x
   x = 163,470,186.34/12,212.28
6. Step 6: Final answer
   x = 13,385.72