Finding the Fourth Proportional to 1,419.74, 2,126.82 and 931.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.74 : 2,126.82 = 931.31 : x
2. Step 2: Convert to fraction form
   1,419.74/2,126.82 = 931.31/x
3. Step 3: Cross multiply
   1,419.74x = 2,126.82 × 931.31
4. Step 4: Simplify right side
   1,419.74x = 1,980,718.10
5. Step 5: Solve for x
   x = 1,980,718.10/1,419.74
6. Step 6: Final answer
   x = 1,395.13