Finding the Fourth Proportional to 1,812.31, 2,498.06 and 1,221.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,812.31 : 2,498.06 = 1,221.82 : x
2. Step 2: Convert to fraction form
   1,812.31/2,498.06 = 1,221.82/x
3. Step 3: Cross multiply
   1,812.31x = 2,498.06 × 1,221.82
4. Step 4: Simplify right side
   1,812.31x = 3,052,176.48
5. Step 5: Solve for x
   x = 3,052,176.48/1,812.31
6. Step 6: Final answer
   x = 1,684.14