Finding the Fourth Proportional to 1,225.86, 1,835.42 and 856.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.86 : 1,835.42 = 856.03 : x
2. Step 2: Convert to fraction form
   1,225.86/1,835.42 = 856.03/x
3. Step 3: Cross multiply
   1,225.86x = 1,835.42 × 856.03
4. Step 4: Simplify right side
   1,225.86x = 1,571,180.85
5. Step 5: Solve for x
   x = 1,571,180.85/1,225.86
6. Step 6: Final answer
   x = 1,281.70