Finding the Fourth Proportional to 256,499.39, 384,768.42 and 76,570.61

Step by Step Solution

1. Step 1: Write the proportion equation
   256,499.39 : 384,768.42 = 76,570.61 : x
2. Step 2: Convert to fraction form
   256,499.39/384,768.42 = 76,570.61/x
3. Step 3: Cross multiply
   256,499.39x = 384,768.42 × 76,570.61
4. Step 4: Simplify right side
   256,499.39x = 29,461,952,628.14
5. Step 5: Solve for x
   x = 29,461,952,628.14/256,499.39
6. Step 6: Final answer
   x = 114,861.69