Finding the Fourth Proportional to 1,662.72, 2,493.49 and 840.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.72 : 2,493.49 = 840.45 : x
2. Step 2: Convert to fraction form
   1,662.72/2,493.49 = 840.45/x
3. Step 3: Cross multiply
   1,662.72x = 2,493.49 × 840.45
4. Step 4: Simplify right side
   1,662.72x = 2,095,653.67
5. Step 5: Solve for x
   x = 2,095,653.67/1,662.72
6. Step 6: Final answer
   x = 1,260.38