Finding the Fourth Proportional to 126,505.05, 189,788.72 and 89,138.10

Step by Step Solution

1. Step 1: Write the proportion equation
   126,505.05 : 189,788.72 = 89,138.10 : x
2. Step 2: Convert to fraction form
   126,505.05/189,788.72 = 89,138.10/x
3. Step 3: Cross multiply
   126,505.05x = 189,788.72 × 89,138.10
4. Step 4: Simplify right side
   126,505.05x = 16,917,405,902.23
5. Step 5: Solve for x
   x = 16,917,405,902.23/126,505.05
6. Step 6: Final answer
   x = 133,729.10