Finding the Fourth Proportional to 2,164.83, 3,246.89 and 931.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.83 : 3,246.89 = 931.91 : x
2. Step 2: Convert to fraction form
   2,164.83/3,246.89 = 931.91/x
3. Step 3: Cross multiply
   2,164.83x = 3,246.89 × 931.91
4. Step 4: Simplify right side
   2,164.83x = 3,025,788.37
5. Step 5: Solve for x
   x = 3,025,788.37/2,164.83
6. Step 6: Final answer
   x = 1,397.70