Finding the Fourth Proportional to 2,105.06, 3,156.37 and 1,007.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.06 : 3,156.37 = 1,007.91 : x
2. Step 2: Convert to fraction form
   2,105.06/3,156.37 = 1,007.91/x
3. Step 3: Cross multiply
   2,105.06x = 3,156.37 × 1,007.91
4. Step 4: Simplify right side
   2,105.06x = 3,181,334.37
5. Step 5: Solve for x
   x = 3,181,334.37/2,105.06
6. Step 6: Final answer
   x = 1,511.28