Finding the Fourth Proportional to 12,478.10, 17,221.25 and 7,173.14

Step by Step Solution

1. Step 1: Write the proportion equation
   12,478.10 : 17,221.25 = 7,173.14 : x
2. Step 2: Convert to fraction form
   12,478.10/17,221.25 = 7,173.14/x
3. Step 3: Cross multiply
   12,478.10x = 17,221.25 × 7,173.14
4. Step 4: Simplify right side
   12,478.10x = 123,530,437.23
5. Step 5: Solve for x
   x = 123,530,437.23/12,478.10
6. Step 6: Final answer
   x = 9,899.78