Finding the Fourth Proportional to 257,855.50, 355,846.72 and 144,686.62

Step by Step Solution

1. Step 1: Write the proportion equation
   257,855.50 : 355,846.72 = 144,686.62 : x
2. Step 2: Convert to fraction form
   257,855.50/355,846.72 = 144,686.62/x
3. Step 3: Cross multiply
   257,855.50x = 355,846.72 × 144,686.62
4. Step 4: Simplify right side
   257,855.50x = 51,486,259,154.89
5. Step 5: Solve for x
   x = 51,486,259,154.89/257,855.50
6. Step 6: Final answer
   x = 199,670.98