Finding the Fourth Proportional to 2,172.99, 2,998.71 and 1,178.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.99 : 2,998.71 = 1,178.28 : x
2. Step 2: Convert to fraction form
   2,172.99/2,998.71 = 1,178.28/x
3. Step 3: Cross multiply
   2,172.99x = 2,998.71 × 1,178.28
4. Step 4: Simplify right side
   2,172.99x = 3,533,320.02
5. Step 5: Solve for x
   x = 3,533,320.02/2,172.99
6. Step 6: Final answer
   x = 1,626.02