Finding the Fourth Proportional to 677,131.09, 1,015,401.35 and 256,111.72

Step by Step Solution

1. Step 1: Write the proportion equation
   677,131.09 : 1,015,401.35 = 256,111.72 : x
2. Step 2: Convert to fraction form
   677,131.09/1,015,401.35 = 256,111.72/x
3. Step 3: Cross multiply
   677,131.09x = 1,015,401.35 × 256,111.72
4. Step 4: Simplify right side
   677,131.09x = 260,056,185,289.71
5. Step 5: Solve for x
   x = 260,056,185,289.71/677,131.09
6. Step 6: Final answer
   x = 384,055.89