Finding the Fourth Proportional to 1,813.31, 2,499.44 and 1,222.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,813.31 : 2,499.44 = 1,222.82 : x
2. Step 2: Convert to fraction form
   1,813.31/2,499.44 = 1,222.82/x
3. Step 3: Cross multiply
   1,813.31x = 2,499.44 × 1,222.82
4. Step 4: Simplify right side
   1,813.31x = 3,056,365.22
5. Step 5: Solve for x
   x = 3,056,365.22/1,813.31
6. Step 6: Final answer
   x = 1,685.52