Finding the Fourth Proportional to 2,117.60, 2,921.82 and 1,186.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.60 : 2,921.82 = 1,186.10 : x
2. Step 2: Convert to fraction form
   2,117.60/2,921.82 = 1,186.10/x
3. Step 3: Cross multiply
   2,117.60x = 2,921.82 × 1,186.10
4. Step 4: Simplify right side
   2,117.60x = 3,465,570.70
5. Step 5: Solve for x
   x = 3,465,570.70/2,117.60
6. Step 6: Final answer
   x = 1,636.56