Finding the Fourth Proportional to 12,390.89, 17,100.61 and 7,084.67

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.89 : 17,100.61 = 7,084.67 : x
2. Step 2: Convert to fraction form
   12,390.89/17,100.61 = 7,084.67/x
3. Step 3: Cross multiply
   12,390.89x = 17,100.61 × 7,084.67
4. Step 4: Simplify right side
   12,390.89x = 121,152,178.65
5. Step 5: Solve for x
   x = 121,152,178.65/12,390.89
6. Step 6: Final answer
   x = 9,777.52