Finding the Fourth Proportional to 2,097.20, 3,146.28 and 1,172.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,097.20 : 3,146.28 = 1,172.30 : x
2. Step 2: Convert to fraction form
   2,097.20/3,146.28 = 1,172.30/x
3. Step 3: Cross multiply
   2,097.20x = 3,146.28 × 1,172.30
4. Step 4: Simplify right side
   2,097.20x = 3,688,384.04
5. Step 5: Solve for x
   x = 3,688,384.04/2,097.20
6. Step 6: Final answer
   x = 1,758.72