Finding the Fourth Proportional to 12,390.84, 17,098.56 and 7,084.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.84 : 17,098.56 = 7,084.80 : x
2. Step 2: Convert to fraction form
   12,390.84/17,098.56 = 7,084.80/x
3. Step 3: Cross multiply
   12,390.84x = 17,098.56 × 7,084.80
4. Step 4: Simplify right side
   12,390.84x = 121,139,877.89
5. Step 5: Solve for x
   x = 121,139,877.89/12,390.84
6. Step 6: Final answer
   x = 9,776.57