Finding the Fourth Proportional to 215,911.98, 298,105.30 and 139,615.65

Step by Step Solution

1. Step 1: Write the proportion equation
   215,911.98 : 298,105.30 = 139,615.65 : x
2. Step 2: Convert to fraction form
   215,911.98/298,105.30 = 139,615.65/x
3. Step 3: Cross multiply
   215,911.98x = 298,105.30 × 139,615.65
4. Step 4: Simplify right side
   215,911.98x = 41,620,165,227.95
5. Step 5: Solve for x
   x = 41,620,165,227.95/215,911.98
6. Step 6: Final answer
   x = 192,764.50