Finding the Fourth Proportional to 12,898.57, 17,800.75 and 9,706.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,898.57 : 17,800.75 = 9,706.12 : x
2. Step 2: Convert to fraction form
   12,898.57/17,800.75 = 9,706.12/x
3. Step 3: Cross multiply
   12,898.57x = 17,800.75 × 9,706.12
4. Step 4: Simplify right side
   12,898.57x = 172,776,178.69
5. Step 5: Solve for x
   x = 172,776,178.69/12,898.57
6. Step 6: Final answer
   x = 13,394.99