Finding the Fourth Proportional to 855,931.86, 1,284,111 and 256,904.10

Step by Step Solution

1. Step 1: Write the proportion equation
   855,931.86 : 1,284,111 = 256,904.10 : x
2. Step 2: Convert to fraction form
   855,931.86/1,284,111 = 256,904.10/x
3. Step 3: Cross multiply
   855,931.86x = 1,284,111 × 256,904.10
4. Step 4: Simplify right side
   855,931.86x = 329,893,380,755.10
5. Step 5: Solve for x
   x = 329,893,380,755.10/855,931.86
6. Step 6: Final answer
   x = 385,420.14