Finding the Fourth Proportional to 2,239.64, 3,090.72 and 1,245.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,239.64 : 3,090.72 = 1,245.02 : x
2. Step 2: Convert to fraction form
   2,239.64/3,090.72 = 1,245.02/x
3. Step 3: Cross multiply
   2,239.64x = 3,090.72 × 1,245.02
4. Step 4: Simplify right side
   2,239.64x = 3,848,008.21
5. Step 5: Solve for x
   x = 3,848,008.21/2,239.64
6. Step 6: Final answer
   x = 1,718.14