Finding the Fourth Proportional to 2,167.23, 2,990.77 and 1,172.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.23 : 2,990.77 = 1,172.50 : x
2. Step 2: Convert to fraction form
   2,167.23/2,990.77 = 1,172.50/x
3. Step 3: Cross multiply
   2,167.23x = 2,990.77 × 1,172.50
4. Step 4: Simplify right side
   2,167.23x = 3,506,667.42
5. Step 5: Solve for x
   x = 3,506,667.42/2,167.23
6. Step 6: Final answer
   x = 1,618.04