Finding the Fourth Proportional to 2,181.79, 3,010.86 and 1,187.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,181.79 : 3,010.86 = 1,187.05 : x
2. Step 2: Convert to fraction form
   2,181.79/3,010.86 = 1,187.05/x
3. Step 3: Cross multiply
   2,181.79x = 3,010.86 × 1,187.05
4. Step 4: Simplify right side
   2,181.79x = 3,574,033.84
5. Step 5: Solve for x
   x = 3,574,033.84/2,181.79
6. Step 6: Final answer
   x = 1,638.12