Finding the Fourth Proportional to 2,071.98, 2,859.10 and 1,188.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.98 : 2,859.10 = 1,188.07 : x
2. Step 2: Convert to fraction form
   2,071.98/2,859.10 = 1,188.07/x
3. Step 3: Cross multiply
   2,071.98x = 2,859.10 × 1,188.07
4. Step 4: Simplify right side
   2,071.98x = 3,396,800.82
5. Step 5: Solve for x
   x = 3,396,800.82/2,071.98
6. Step 6: Final answer
   x = 1,639.40