Finding the Fourth Proportional to 91,938.72, 126,776.16 and 83,890.56

Step by Step Solution

1. Step 1: Write the proportion equation
   91,938.72 : 126,776.16 = 83,890.56 : x
2. Step 2: Convert to fraction form
   91,938.72/126,776.16 = 83,890.56/x
3. Step 3: Cross multiply
   91,938.72x = 126,776.16 × 83,890.56
4. Step 4: Simplify right side
   91,938.72x = 10,635,323,057.05
5. Step 5: Solve for x
   x = 10,635,323,057.05/91,938.72
6. Step 6: Final answer
   x = 115,678.39