Finding the Fourth Proportional to 216,109.81, 298,389.59 and 139,674.16

Step by Step Solution

1. Step 1: Write the proportion equation
   216,109.81 : 298,389.59 = 139,674.16 : x
2. Step 2: Convert to fraction form
   216,109.81/298,389.59 = 139,674.16/x
3. Step 3: Cross multiply
   216,109.81x = 298,389.59 × 139,674.16
4. Step 4: Simplify right side
   216,109.81x = 41,677,315,335.99
5. Step 5: Solve for x
   x = 41,677,315,335.99/216,109.81
6. Step 6: Final answer
   x = 192,852.49