Finding the Fourth Proportional to 1,813.31, 2,502.22 and 1,005.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,813.31 : 2,502.22 = 1,005.72 : x
2. Step 2: Convert to fraction form
   1,813.31/2,502.22 = 1,005.72/x
3. Step 3: Cross multiply
   1,813.31x = 2,502.22 × 1,005.72
4. Step 4: Simplify right side
   1,813.31x = 2,516,519.86
5. Step 5: Solve for x
   x = 2,516,519.86/1,813.31
6. Step 6: Final answer
   x = 1,387.80