Finding the Fourth Proportional to 1,665.31, 2,494.07 and 1,316.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.31 : 2,494.07 = 1,316.30 : x
2. Step 2: Convert to fraction form
   1,665.31/2,494.07 = 1,316.30/x
3. Step 3: Cross multiply
   1,665.31x = 2,494.07 × 1,316.30
4. Step 4: Simplify right side
   1,665.31x = 3,282,944.34
5. Step 5: Solve for x
   x = 3,282,944.34/1,665.31
6. Step 6: Final answer
   x = 1,971.37