Finding the Fourth Proportional to 12,340.34, 17,022.90 and 7,856.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,340.34 : 17,022.90 = 7,856.18 : x
2. Step 2: Convert to fraction form
   12,340.34/17,022.90 = 7,856.18/x
3. Step 3: Cross multiply
   12,340.34x = 17,022.90 × 7,856.18
4. Step 4: Simplify right side
   12,340.34x = 133,734,966.52
5. Step 5: Solve for x
   x = 133,734,966.52/12,340.34
6. Step 6: Final answer
   x = 10,837.22