Finding the Fourth Proportional to 2,211.34, 3,317.89 and 912.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.34 : 3,317.89 = 912.51 : x
2. Step 2: Convert to fraction form
   2,211.34/3,317.89 = 912.51/x
3. Step 3: Cross multiply
   2,211.34x = 3,317.89 × 912.51
4. Step 4: Simplify right side
   2,211.34x = 3,027,607.80
5. Step 5: Solve for x
   x = 3,027,607.80/2,211.34
6. Step 6: Final answer
   x = 1,369.13