Finding the Fourth Proportional to 8,998.16, 12,421.76 and 5,642.73

Step by Step Solution

1. Step 1: Write the proportion equation
   8,998.16 : 12,421.76 = 5,642.73 : x
2. Step 2: Convert to fraction form
   8,998.16/12,421.76 = 5,642.73/x
3. Step 3: Cross multiply
   8,998.16x = 12,421.76 × 5,642.73
4. Step 4: Simplify right side
   8,998.16x = 70,092,609.59
5. Step 5: Solve for x
   x = 70,092,609.59/8,998.16
6. Step 6: Final answer
   x = 7,789.66