Finding the Fourth Proportional to 12,987.30, 17,922.56 and 7,018.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987.30 : 17,922.56 = 7,018.96 : x
2. Step 2: Convert to fraction form
   12,987.30/17,922.56 = 7,018.96/x
3. Step 3: Cross multiply
   12,987.30x = 17,922.56 × 7,018.96
4. Step 4: Simplify right side
   12,987.30x = 125,797,624.58
5. Step 5: Solve for x
   x = 125,797,624.58/12,987.30
6. Step 6: Final answer
   x = 9,686.20