Finding the Fourth Proportional to 391,069, 539,675.24 and 212,221

Step by Step Solution

1. Step 1: Write the proportion equation
   391,069 : 539,675.24 = 212,221 : x
2. Step 2: Convert to fraction form
   391,069/539,675.24 = 212,221/x
3. Step 3: Cross multiply
   391,069x = 539,675.24 × 212,221
4. Step 4: Simplify right side
   391,069x = 114,530,419,108.04
5. Step 5: Solve for x
   x = 114,530,419,108.04/391,069
6. Step 6: Final answer
   x = 292,864.99