Finding the Fourth Proportional to 12,019.23, 17,997.30 and 8,490.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,019.23 : 17,997.30 = 8,490.15 : x
2. Step 2: Convert to fraction form
   12,019.23/17,997.30 = 8,490.15/x
3. Step 3: Cross multiply
   12,019.23x = 17,997.30 × 8,490.15
4. Step 4: Simplify right side
   12,019.23x = 152,799,776.60
5. Step 5: Solve for x
   x = 152,799,776.60/12,019.23
6. Step 6: Final answer
   x = 12,712.94