Finding the Fourth Proportional to 142,128.46, 213,304.05 and 99,154.42

Step by Step Solution

1. Step 1: Write the proportion equation
   142,128.46 : 213,304.05 = 99,154.42 : x
2. Step 2: Convert to fraction form
   142,128.46/213,304.05 = 99,154.42/x
3. Step 3: Cross multiply
   142,128.46x = 213,304.05 × 99,154.42
4. Step 4: Simplify right side
   142,128.46x = 21,150,039,361.40
5. Step 5: Solve for x
   x = 21,150,039,361.40/142,128.46
6. Step 6: Final answer
   x = 148,809.32