Finding the Fourth Proportional to 256,499.87, 384,791.15 and 79,006.80

Step by Step Solution

1. Step 1: Write the proportion equation
   256,499.87 : 384,791.15 = 79,006.80 : x
2. Step 2: Convert to fraction form
   256,499.87/384,791.15 = 79,006.80/x
3. Step 3: Cross multiply
   256,499.87x = 384,791.15 × 79,006.80
4. Step 4: Simplify right side
   256,499.87x = 30,401,115,110.83
5. Step 5: Solve for x
   x = 30,401,115,110.83/256,499.87
6. Step 6: Final answer
   x = 118,522.93