Finding the Fourth Proportional to 142,640.10, 213,839.73 and 89,933.40

Step by Step Solution

1. Step 1: Write the proportion equation
   142,640.10 : 213,839.73 = 89,933.40 : x
2. Step 2: Convert to fraction form
   142,640.10/213,839.73 = 89,933.40/x
3. Step 3: Cross multiply
   142,640.10x = 213,839.73 × 89,933.40
4. Step 4: Simplify right side
   142,640.10x = 19,231,333,973.98
5. Step 5: Solve for x
   x = 19,231,333,973.98/142,640.10
6. Step 6: Final answer
   x = 134,824.18