Finding the Fourth Proportional to 2,071.49, 2,858.85 and 1,187.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.49 : 2,858.85 = 1,187.55 : x
2. Step 2: Convert to fraction form
   2,071.49/2,858.85 = 1,187.55/x
3. Step 3: Cross multiply
   2,071.49x = 2,858.85 × 1,187.55
4. Step 4: Simplify right side
   2,071.49x = 3,395,027.32
5. Step 5: Solve for x
   x = 3,395,027.32/2,071.49
6. Step 6: Final answer
   x = 1,638.93