Finding the Fourth Proportional to 398,091.27, 596,604.89 and 145,134.15

Step by Step Solution

1. Step 1: Write the proportion equation
   398,091.27 : 596,604.89 = 145,134.15 : x
2. Step 2: Convert to fraction form
   398,091.27/596,604.89 = 145,134.15/x
3. Step 3: Cross multiply
   398,091.27x = 596,604.89 × 145,134.15
4. Step 4: Simplify right side
   398,091.27x = 86,587,741,721.56
5. Step 5: Solve for x
   x = 86,587,741,721.56/398,091.27
6. Step 6: Final answer
   x = 217,507.26