Finding the Fourth Proportional to 391,308.24, 540,018.72 and 219,233.46

Step by Step Solution

1. Step 1: Write the proportion equation
   391,308.24 : 540,018.72 = 219,233.46 : x
2. Step 2: Convert to fraction form
   391,308.24/540,018.72 = 219,233.46/x
3. Step 3: Cross multiply
   391,308.24x = 540,018.72 × 219,233.46
4. Step 4: Simplify right side
   391,308.24x = 118,390,172,450.37
5. Step 5: Solve for x
   x = 118,390,172,450.37/391,308.24
6. Step 6: Final answer
   x = 302,549.65