Finding the Fourth Proportional to 1,666.31, 2,495.57 and 1,317.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,666.31 : 2,495.57 = 1,317.30 : x
2. Step 2: Convert to fraction form
   1,666.31/2,495.57 = 1,317.30/x
3. Step 3: Cross multiply
   1,666.31x = 2,495.57 × 1,317.30
4. Step 4: Simplify right side
   1,666.31x = 3,287,414.36
5. Step 5: Solve for x
   x = 3,287,414.36/1,666.31
6. Step 6: Final answer
   x = 1,972.87