Finding the Fourth Proportional to 214,141.89, 321,676.34 and 139,223.51

Step by Step Solution

1. Step 1: Write the proportion equation
   214,141.89 : 321,676.34 = 139,223.51 : x
2. Step 2: Convert to fraction form
   214,141.89/321,676.34 = 139,223.51/x
3. Step 3: Cross multiply
   214,141.89x = 321,676.34 × 139,223.51
4. Step 4: Simplify right side
   214,141.89x = 44,784,906,834.25
5. Step 5: Solve for x
   x = 44,784,906,834.25/214,141.89
6. Step 6: Final answer
   x = 209,136.60