Finding the Fourth Proportional to 2,071.14, 2,858.31 and 1,187.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.14 : 2,858.31 = 1,187.10 : x
2. Step 2: Convert to fraction form
   2,071.14/2,858.31 = 1,187.10/x
3. Step 3: Cross multiply
   2,071.14x = 2,858.31 × 1,187.10
4. Step 4: Simplify right side
   2,071.14x = 3,393,099.80
5. Step 5: Solve for x
   x = 3,393,099.80/2,071.14
6. Step 6: Final answer
   x = 1,638.28