Finding the Fourth Proportional to 2,118.34, 3,176.04 and 931.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.34 : 3,176.04 = 931.81 : x
2. Step 2: Convert to fraction form
   2,118.34/3,176.04 = 931.81/x
3. Step 3: Cross multiply
   2,118.34x = 3,176.04 × 931.81
4. Step 4: Simplify right side
   2,118.34x = 2,959,445.29
5. Step 5: Solve for x
   x = 2,959,445.29/2,118.34
6. Step 6: Final answer
   x = 1,397.06