Finding the Fourth Proportional to 1,731.80, 2,389.56 and 1,172.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,731.80 : 2,389.56 = 1,172.72 : x
2. Step 2: Convert to fraction form
   1,731.80/2,389.56 = 1,172.72/x
3. Step 3: Cross multiply
   1,731.80x = 2,389.56 × 1,172.72
4. Step 4: Simplify right side
   1,731.80x = 2,802,284.80
5. Step 5: Solve for x
   x = 2,802,284.80/1,731.80
6. Step 6: Final answer
   x = 1,618.13