Finding the Fourth Proportional to 2,071.43, 2,858.59 and 1,187.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.43 : 2,858.59 = 1,187.29 : x
2. Step 2: Convert to fraction form
   2,071.43/2,858.59 = 1,187.29/x
3. Step 3: Cross multiply
   2,071.43x = 2,858.59 × 1,187.29
4. Step 4: Simplify right side
   2,071.43x = 3,393,975.93
5. Step 5: Solve for x
   x = 3,393,975.93/2,071.43
6. Step 6: Final answer
   x = 1,638.47