Finding the Fourth Proportional to 8,998.91, 12,410.44 and 5,642.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,998.91 : 12,410.44 = 5,642.09 : x
2. Step 2: Convert to fraction form
   8,998.91/12,410.44 = 5,642.09/x
3. Step 3: Cross multiply
   8,998.91x = 12,410.44 × 5,642.09
4. Step 4: Simplify right side
   8,998.91x = 70,020,819.42
5. Step 5: Solve for x
   x = 70,020,819.42/8,998.91
6. Step 6: Final answer
   x = 7,781.03