Finding the Fourth Proportional to 12,998.18, 19,499.30 and 4,231.03

Step by Step Solution

1. Step 1: Write the proportion equation
   12,998.18 : 19,499.30 = 4,231.03 : x
2. Step 2: Convert to fraction form
   12,998.18/19,499.30 = 4,231.03/x
3. Step 3: Cross multiply
   12,998.18x = 19,499.30 × 4,231.03
4. Step 4: Simplify right side
   12,998.18x = 82,502,123.28
5. Step 5: Solve for x
   x = 82,502,123.28/12,998.18
6. Step 6: Final answer
   x = 6,347.21