Finding the Fourth Proportional to 2,239.72, 3,090.96 and 1,245.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,239.72 : 3,090.96 = 1,245.17 : x
2. Step 2: Convert to fraction form
   2,239.72/3,090.96 = 1,245.17/x
3. Step 3: Cross multiply
   2,239.72x = 3,090.96 × 1,245.17
4. Step 4: Simplify right side
   2,239.72x = 3,848,778.39
5. Step 5: Solve for x
   x = 3,848,778.39/2,239.72
6. Step 6: Final answer
   x = 1,718.42