Finding the Fourth Proportional to 398,409.82, 549,805.56 and 219,561.82

Step by Step Solution

1. Step 1: Write the proportion equation
   398,409.82 : 549,805.56 = 219,561.82 : x
2. Step 2: Convert to fraction form
   398,409.82/549,805.56 = 219,561.82/x
3. Step 3: Cross multiply
   398,409.82x = 549,805.56 × 219,561.82
4. Step 4: Simplify right side
   398,409.82x = 120,716,309,399.72
5. Step 5: Solve for x
   x = 120,716,309,399.72/398,409.82
6. Step 6: Final answer
   x = 302,995.32