Finding the Fourth Proportional to 12,019.73, 17,998.05 and 8,490.65

Step by Step Solution

1. Step 1: Write the proportion equation
   12,019.73 : 17,998.05 = 8,490.65 : x
2. Step 2: Convert to fraction form
   12,019.73/17,998.05 = 8,490.65/x
3. Step 3: Cross multiply
   12,019.73x = 17,998.05 × 8,490.65
4. Step 4: Simplify right side
   12,019.73x = 152,815,143.23
5. Step 5: Solve for x
   x = 152,815,143.23/12,019.73
6. Step 6: Final answer
   x = 12,713.69