Finding the Fourth Proportional to 2,071.59, 2,858.94 and 1,187.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.59 : 2,858.94 = 1,187.61 : x
2. Step 2: Convert to fraction form
   2,071.59/2,858.94 = 1,187.61/x
3. Step 3: Cross multiply
   2,071.59x = 2,858.94 × 1,187.61
4. Step 4: Simplify right side
   2,071.59x = 3,395,305.73
5. Step 5: Solve for x
   x = 3,395,305.73/2,071.59
6. Step 6: Final answer
   x = 1,638.99