Finding the Fourth Proportional to 12,571.18, 17,345.12 and 7,120.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,571.18 : 17,345.12 = 7,120.34 : x
2. Step 2: Convert to fraction form
   12,571.18/17,345.12 = 7,120.34/x
3. Step 3: Cross multiply
   12,571.18x = 17,345.12 × 7,120.34
4. Step 4: Simplify right side
   12,571.18x = 123,503,134.51
5. Step 5: Solve for x
   x = 123,503,134.51/12,571.18
6. Step 6: Final answer
   x = 9,824.30