Finding the Fourth Proportional to 2,105.16, 3,156.40 and 1,812.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.16 : 3,156.40 = 1,812.76 : x
2. Step 2: Convert to fraction form
   2,105.16/3,156.40 = 1,812.76/x
3. Step 3: Cross multiply
   2,105.16x = 3,156.40 × 1,812.76
4. Step 4: Simplify right side
   2,105.16x = 5,721,795.66
5. Step 5: Solve for x
   x = 5,721,795.66/2,105.16
6. Step 6: Final answer
   x = 2,717.99