Finding the Fourth Proportional to 2,117.56, 3,171.30 and 1,249.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.56 : 3,171.30 = 1,249.24 : x
2. Step 2: Convert to fraction form
   2,117.56/3,171.30 = 1,249.24/x
3. Step 3: Cross multiply
   2,117.56x = 3,171.30 × 1,249.24
4. Step 4: Simplify right side
   2,117.56x = 3,961,714.81
5. Step 5: Solve for x
   x = 3,961,714.81/2,117.56
6. Step 6: Final answer
   x = 1,870.89