Finding the Fourth Proportional to 1,383.55, 1,910.08 and 912.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.55 : 1,910.08 = 912.26 : x
2. Step 2: Convert to fraction form
   1,383.55/1,910.08 = 912.26/x
3. Step 3: Cross multiply
   1,383.55x = 1,910.08 × 912.26
4. Step 4: Simplify right side
   1,383.55x = 1,742,495.50
5. Step 5: Solve for x
   x = 1,742,495.50/1,383.55
6. Step 6: Final answer
   x = 1,259.44