Finding the Fourth Proportional to 2,172.89, 2,998.56 and 1,178.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.89 : 2,998.56 = 1,178.16 : x
2. Step 2: Convert to fraction form
   2,172.89/2,998.56 = 1,178.16/x
3. Step 3: Cross multiply
   2,172.89x = 2,998.56 × 1,178.16
4. Step 4: Simplify right side
   2,172.89x = 3,532,783.45
5. Step 5: Solve for x
   x = 3,532,783.45/2,172.89
6. Step 6: Final answer
   x = 1,625.85