Finding the Fourth Proportional to 17,143.81, 25,706.46 and 7,778.72

Step by Step Solution

1. Step 1: Write the proportion equation
   17,143.81 : 25,706.46 = 7,778.72 : x
2. Step 2: Convert to fraction form
   17,143.81/25,706.46 = 7,778.72/x
3. Step 3: Cross multiply
   17,143.81x = 25,706.46 × 7,778.72
4. Step 4: Simplify right side
   17,143.81x = 199,963,354.53
5. Step 5: Solve for x
   x = 199,963,354.53/17,143.81
6. Step 6: Final answer
   x = 11,663.88