Finding the Fourth Proportional to 3,761.31, 5,645.21 and 1,815.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,761.31 : 5,645.21 = 1,815.15 : x
2. Step 2: Convert to fraction form
   3,761.31/5,645.21 = 1,815.15/x
3. Step 3: Cross multiply
   3,761.31x = 5,645.21 × 1,815.15
4. Step 4: Simplify right side
   3,761.31x = 10,246,893.86
5. Step 5: Solve for x
   x = 10,246,893.86/3,761.31
6. Step 6: Final answer
   x = 2,724.29