Finding the Fourth Proportional to 1,225.88, 1,690.88 and 847.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.88 : 1,690.88 = 847.89 : x
2. Step 2: Convert to fraction form
   1,225.88/1,690.88 = 847.89/x
3. Step 3: Cross multiply
   1,225.88x = 1,690.88 × 847.89
4. Step 4: Simplify right side
   1,225.88x = 1,433,680.76
5. Step 5: Solve for x
   x = 1,433,680.76/1,225.88
6. Step 6: Final answer
   x = 1,169.51