Finding the Fourth Proportional to 283,145.98, 390,740.61 and 155,821.48

Step by Step Solution

1. Step 1: Write the proportion equation
   283,145.98 : 390,740.61 = 155,821.48 : x
2. Step 2: Convert to fraction form
   283,145.98/390,740.61 = 155,821.48/x
3. Step 3: Cross multiply
   283,145.98x = 390,740.61 × 155,821.48
4. Step 4: Simplify right side
   283,145.98x = 60,885,780,146.30
5. Step 5: Solve for x
   x = 60,885,780,146.30/283,145.98
6. Step 6: Final answer
   x = 215,033.18