Finding the Fourth Proportional to 256,716.74, 384,993.18 and 88,196.42

Step by Step Solution

1. Step 1: Write the proportion equation
   256,716.74 : 384,993.18 = 88,196.42 : x
2. Step 2: Convert to fraction form
   256,716.74/384,993.18 = 88,196.42/x
3. Step 3: Cross multiply
   256,716.74x = 384,993.18 × 88,196.42
4. Step 4: Simplify right side
   256,716.74x = 33,955,020,200.42
5. Step 5: Solve for x
   x = 33,955,020,200.42/256,716.74
6. Step 6: Final answer
   x = 132,266.48