Finding the Fourth Proportional to 2,117.38, 2,921.89 and 1,173.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.38 : 2,921.89 = 1,173.17 : x
2. Step 2: Convert to fraction form
   2,117.38/2,921.89 = 1,173.17/x
3. Step 3: Cross multiply
   2,117.38x = 2,921.89 × 1,173.17
4. Step 4: Simplify right side
   2,117.38x = 3,427,853.22
5. Step 5: Solve for x
   x = 3,427,853.22/2,117.38
6. Step 6: Final answer
   x = 1,618.92