Finding the Fourth Proportional to 246,667.89, 340,402.73 and 139,239.21

Step by Step Solution

1. Step 1: Write the proportion equation
   246,667.89 : 340,402.73 = 139,239.21 : x
2. Step 2: Convert to fraction form
   246,667.89/340,402.73 = 139,239.21/x
3. Step 3: Cross multiply
   246,667.89x = 340,402.73 × 139,239.21
4. Step 4: Simplify right side
   246,667.89x = 47,397,406,510.85
5. Step 5: Solve for x
   x = 47,397,406,510.85/246,667.89
6. Step 6: Final answer
   x = 192,150.70