Finding the Fourth Proportional to 2,071.27, 2,858.48 and 1,187.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.27 : 2,858.48 = 1,187.13 : x
2. Step 2: Convert to fraction form
   2,071.27/2,858.48 = 1,187.13/x
3. Step 3: Cross multiply
   2,071.27x = 2,858.48 × 1,187.13
4. Step 4: Simplify right side
   2,071.27x = 3,393,386.89
5. Step 5: Solve for x
   x = 3,393,386.89/2,071.27
6. Step 6: Final answer
   x = 1,638.31