Finding the Fourth Proportional to 2,100.86, 3,152.34 and 931.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.86 : 3,152.34 = 931.11 : x
2. Step 2: Convert to fraction form
   2,100.86/3,152.34 = 931.11/x
3. Step 3: Cross multiply
   2,100.86x = 3,152.34 × 931.11
4. Step 4: Simplify right side
   2,100.86x = 2,935,175.30
5. Step 5: Solve for x
   x = 2,935,175.30/2,100.86
6. Step 6: Final answer
   x = 1,397.13