Finding the Fourth Proportional to 2,100.75, 3,152.22 and 931.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.75 : 3,152.22 = 931.56 : x
2. Step 2: Convert to fraction form
   2,100.75/3,152.22 = 931.56/x
3. Step 3: Cross multiply
   2,100.75x = 3,152.22 × 931.56
4. Step 4: Simplify right side
   2,100.75x = 2,936,485.29
5. Step 5: Solve for x
   x = 2,936,485.29/2,100.75
6. Step 6: Final answer
   x = 1,397.83