Finding the Fourth Proportional to 12,457.31, 17,190.98 and 6,868.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,457.31 : 17,190.98 = 6,868.31 : x
2. Step 2: Convert to fraction form
   12,457.31/17,190.98 = 6,868.31/x
3. Step 3: Cross multiply
   12,457.31x = 17,190.98 × 6,868.31
4. Step 4: Simplify right side
   12,457.31x = 118,072,945.50
5. Step 5: Solve for x
   x = 118,072,945.50/12,457.31
6. Step 6: Final answer
   x = 9,478.21