Finding the Fourth Proportional to 257,983.83, 356,010.89 and 143,258.94

Step by Step Solution

1. Step 1: Write the proportion equation
   257,983.83 : 356,010.89 = 143,258.94 : x
2. Step 2: Convert to fraction form
   257,983.83/356,010.89 = 143,258.94/x
3. Step 3: Cross multiply
   257,983.83x = 356,010.89 × 143,258.94
4. Step 4: Simplify right side
   257,983.83x = 51,001,742,013.56
5. Step 5: Solve for x
   x = 51,001,742,013.56/257,983.83
6. Step 6: Final answer
   x = 197,693.56