Finding the Fourth Proportional to 12,390.17, 17,099.60 and 7,083.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.17 : 17,099.60 = 7,083.95 : x
2. Step 2: Convert to fraction form
   12,390.17/17,099.60 = 7,083.95/x
3. Step 3: Cross multiply
   12,390.17x = 17,099.60 × 7,083.95
4. Step 4: Simplify right side
   12,390.17x = 121,132,590.50
5. Step 5: Solve for x
   x = 121,132,590.50/12,390.17
6. Step 6: Final answer
   x = 9,776.51