Finding the Fourth Proportional to 142,128.32, 196,018.40 and 106,402.88

Step by Step Solution

1. Step 1: Write the proportion equation
   142,128.32 : 196,018.40 = 106,402.88 : x
2. Step 2: Convert to fraction form
   142,128.32/196,018.40 = 106,402.88/x
3. Step 3: Cross multiply
   142,128.32x = 196,018.40 × 106,402.88
4. Step 4: Simplify right side
   142,128.32x = 20,856,922,292.99
5. Step 5: Solve for x
   x = 20,856,922,292.99/142,128.32
6. Step 6: Final answer
   x = 146,747.12