Finding the Fourth Proportional to 389,045.37, 536,886.71 and 219,279.49

Step by Step Solution

1. Step 1: Write the proportion equation
   389,045.37 : 536,886.71 = 219,279.49 : x
2. Step 2: Convert to fraction form
   389,045.37/536,886.71 = 219,279.49/x
3. Step 3: Cross multiply
   389,045.37x = 536,886.71 × 219,279.49
4. Step 4: Simplify right side
   389,045.37x = 117,728,245,360.25
5. Step 5: Solve for x
   x = 117,728,245,360.25/389,045.37
6. Step 6: Final answer
   x = 302,608.01