Finding the Fourth Proportional to 142,402.78, 196,580.28 and 91,489.42

Step by Step Solution

1. Step 1: Write the proportion equation
   142,402.78 : 196,580.28 = 91,489.42 : x
2. Step 2: Convert to fraction form
   142,402.78/196,580.28 = 91,489.42/x
3. Step 3: Cross multiply
   142,402.78x = 196,580.28 × 91,489.42
4. Step 4: Simplify right side
   142,402.78x = 17,985,015,800.64
5. Step 5: Solve for x
   x = 17,985,015,800.64/142,402.78
6. Step 6: Final answer
   x = 126,296.80