Finding the Fourth Proportional to 283,142.50, 390,736.52 and 155,818.10

Step by Step Solution

1. Step 1: Write the proportion equation
   283,142.50 : 390,736.52 = 155,818.10 : x
2. Step 2: Convert to fraction form
   283,142.50/390,736.52 = 155,818.10/x
3. Step 3: Cross multiply
   283,142.50x = 390,736.52 × 155,818.10
4. Step 4: Simplify right side
   283,142.50x = 60,883,821,607.66
5. Step 5: Solve for x
   x = 60,883,821,607.66/283,142.50
6. Step 6: Final answer
   x = 215,028.90