Finding the Fourth Proportional to 17,678.10, 26,513.91 and 7,147.56

Step by Step Solution

1. Step 1: Write the proportion equation
   17,678.10 : 26,513.91 = 7,147.56 : x
2. Step 2: Convert to fraction form
   17,678.10/26,513.91 = 7,147.56/x
3. Step 3: Cross multiply
   17,678.10x = 26,513.91 × 7,147.56
4. Step 4: Simplify right side
   17,678.10x = 189,509,762.56
5. Step 5: Solve for x
   x = 189,509,762.56/17,678.10
6. Step 6: Final answer
   x = 10,720.03