Finding the Fourth Proportional to 2,167.39, 2,990.98 and 1,172.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.39 : 2,990.98 = 1,172.67 : x
2. Step 2: Convert to fraction form
   2,167.39/2,990.98 = 1,172.67/x
3. Step 3: Cross multiply
   2,167.39x = 2,990.98 × 1,172.67
4. Step 4: Simplify right side
   2,167.39x = 3,507,432.52
5. Step 5: Solve for x
   x = 3,507,432.52/2,167.39
6. Step 6: Final answer
   x = 1,618.27