Finding the Fourth Proportional to 2,071.34, 2,858.46 and 1,187.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.34 : 2,858.46 = 1,187.15 : x
2. Step 2: Convert to fraction form
   2,071.34/2,858.46 = 1,187.15/x
3. Step 3: Cross multiply
   2,071.34x = 2,858.46 × 1,187.15
4. Step 4: Simplify right side
   2,071.34x = 3,393,410.08
5. Step 5: Solve for x
   x = 3,393,410.08/2,071.34
6. Step 6: Final answer
   x = 1,638.26