Finding the Fourth Proportional to 1,811.67, 2,499.10 and 1,181.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,811.67 : 2,499.10 = 1,181.31 : x
2. Step 2: Convert to fraction form
   1,811.67/2,499.10 = 1,181.31/x
3. Step 3: Cross multiply
   1,811.67x = 2,499.10 × 1,181.31
4. Step 4: Simplify right side
   1,811.67x = 2,952,211.82
5. Step 5: Solve for x
   x = 2,952,211.82/1,811.67
6. Step 6: Final answer
   x = 1,629.55