Finding the Fourth Proportional to 142,795.60, 213,988.60 and 105,061.20

Step by Step Solution

1. Step 1: Write the proportion equation
   142,795.60 : 213,988.60 = 105,061.20 : x
2. Step 2: Convert to fraction form
   142,795.60/213,988.60 = 105,061.20/x
3. Step 3: Cross multiply
   142,795.60x = 213,988.60 × 105,061.20
4. Step 4: Simplify right side
   142,795.60x = 22,481,899,102.32
5. Step 5: Solve for x
   x = 22,481,899,102.32/142,795.60
6. Step 6: Final answer
   x = 157,441.12