Finding the Fourth Proportional to 2,647.50, 3,970.59 and 1,087.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.50 : 3,970.59 = 1,087.94 : x
2. Step 2: Convert to fraction form
   2,647.50/3,970.59 = 1,087.94/x
3. Step 3: Cross multiply
   2,647.50x = 3,970.59 × 1,087.94
4. Step 4: Simplify right side
   2,647.50x = 4,319,763.68
5. Step 5: Solve for x
   x = 4,319,763.68/2,647.50
6. Step 6: Final answer
   x = 1,631.64