Finding the Fourth Proportional to 2,071.59, 2,858.79 and 1,187.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.59 : 2,858.79 = 1,187.88 : x
2. Step 2: Convert to fraction form
   2,071.59/2,858.79 = 1,187.88/x
3. Step 3: Cross multiply
   2,071.59x = 2,858.79 × 1,187.88
4. Step 4: Simplify right side
   2,071.59x = 3,395,899.47
5. Step 5: Solve for x
   x = 3,395,899.47/2,071.59
6. Step 6: Final answer
   x = 1,639.27