Finding the Fourth Proportional to 91,355.69, 137,057.18 and 28,174.42

Step by Step Solution

1. Step 1: Write the proportion equation
   91,355.69 : 137,057.18 = 28,174.42 : x
2. Step 2: Convert to fraction form
   91,355.69/137,057.18 = 28,174.42/x
3. Step 3: Cross multiply
   91,355.69x = 137,057.18 × 28,174.42
4. Step 4: Simplify right side
   91,355.69x = 3,861,505,812.84
5. Step 5: Solve for x
   x = 3,861,505,812.84/91,355.69
6. Step 6: Final answer
   x = 42,268.92