Finding the Fourth Proportional to 1,641.51, 2,463.93 and 820.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.51 : 2,463.93 = 820.37 : x
2. Step 2: Convert to fraction form
   1,641.51/2,463.93 = 820.37/x
3. Step 3: Cross multiply
   1,641.51x = 2,463.93 × 820.37
4. Step 4: Simplify right side
   1,641.51x = 2,021,317.83
5. Step 5: Solve for x
   x = 2,021,317.83/1,641.51
6. Step 6: Final answer
   x = 1,231.38