Finding the Fourth Proportional to 1,638.53, 2,460.94 and 1,404.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.53 : 2,460.94 = 1,404.80 : x
2. Step 2: Convert to fraction form
   1,638.53/2,460.94 = 1,404.80/x
3. Step 3: Cross multiply
   1,638.53x = 2,460.94 × 1,404.80
4. Step 4: Simplify right side
   1,638.53x = 3,457,128.51
5. Step 5: Solve for x
   x = 3,457,128.51/1,638.53
6. Step 6: Final answer
   x = 2,109.90