Finding the Fourth Proportional to 12,390.41, 17,099.28 and 7,085.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.41 : 17,099.28 = 7,085.22 : x
2. Step 2: Convert to fraction form
   12,390.41/17,099.28 = 7,085.22/x
3. Step 3: Cross multiply
   12,390.41x = 17,099.28 × 7,085.22
4. Step 4: Simplify right side
   12,390.41x = 121,152,160.64
5. Step 5: Solve for x
   x = 121,152,160.64/12,390.41
6. Step 6: Final answer
   x = 9,777.90