Finding the Fourth Proportional to 256,536.72, 354,014.55 and 143,381.34

Step by Step Solution

1. Step 1: Write the proportion equation
   256,536.72 : 354,014.55 = 143,381.34 : x
2. Step 2: Convert to fraction form
   256,536.72/354,014.55 = 143,381.34/x
3. Step 3: Cross multiply
   256,536.72x = 354,014.55 × 143,381.34
4. Step 4: Simplify right side
   256,536.72x = 50,759,080,558.50
5. Step 5: Solve for x
   x = 50,759,080,558.50/256,536.72
6. Step 6: Final answer
   x = 197,862.83