Finding the Fourth Proportional to 142,821.42, 214,382.88 and 139,604.47

Step by Step Solution

1. Step 1: Write the proportion equation
   142,821.42 : 214,382.88 = 139,604.47 : x
2. Step 2: Convert to fraction form
   142,821.42/214,382.88 = 139,604.47/x
3. Step 3: Cross multiply
   142,821.42x = 214,382.88 × 139,604.47
4. Step 4: Simplify right side
   142,821.42x = 29,928,808,339.47
5. Step 5: Solve for x
   x = 29,928,808,339.47/142,821.42
6. Step 6: Final answer
   x = 209,554.06