Finding the Fourth Proportional to 12,106.50, 16,705.40 and 7,069.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,106.50 : 16,705.40 = 7,069.72 : x
2. Step 2: Convert to fraction form
   12,106.50/16,705.40 = 7,069.72/x
3. Step 3: Cross multiply
   12,106.50x = 16,705.40 × 7,069.72
4. Step 4: Simplify right side
   12,106.50x = 118,102,500.49
5. Step 5: Solve for x
   x = 118,102,500.49/12,106.50
6. Step 6: Final answer
   x = 9,755.30