Finding the Fourth Proportional to 142,256.16, 213,518.18 and 72,185.76

Step by Step Solution

1. Step 1: Write the proportion equation
   142,256.16 : 213,518.18 = 72,185.76 : x
2. Step 2: Convert to fraction form
   142,256.16/213,518.18 = 72,185.76/x
3. Step 3: Cross multiply
   142,256.16x = 213,518.18 × 72,185.76
4. Step 4: Simplify right side
   142,256.16x = 15,412,972,097.12
5. Step 5: Solve for x
   x = 15,412,972,097.12/142,256.16
6. Step 6: Final answer
   x = 108,346.61