Finding the Fourth Proportional to 1,811.31, 2,499.30 and 1,181.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,811.31 : 2,499.30 = 1,181.67 : x
2. Step 2: Convert to fraction form
   1,811.31/2,499.30 = 1,181.67/x
3. Step 3: Cross multiply
   1,811.31x = 2,499.30 × 1,181.67
4. Step 4: Simplify right side
   1,811.31x = 2,953,347.83
5. Step 5: Solve for x
   x = 2,953,347.83/1,811.31
6. Step 6: Final answer
   x = 1,630.50