Finding the Fourth Proportional to 2,181.89, 3,011.02 and 1,187.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,181.89 : 3,011.02 = 1,187.21 : x
2. Step 2: Convert to fraction form
   2,181.89/3,011.02 = 1,187.21/x
3. Step 3: Cross multiply
   2,181.89x = 3,011.02 × 1,187.21
4. Step 4: Simplify right side
   2,181.89x = 3,574,707.35
5. Step 5: Solve for x
   x = 3,574,707.35/2,181.89
6. Step 6: Final answer
   x = 1,638.36