Finding the Fourth Proportional to 2,645.10, 3,967.43 and 890.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.10 : 3,967.43 = 890.01 : x
2. Step 2: Convert to fraction form
   2,645.10/3,967.43 = 890.01/x
3. Step 3: Cross multiply
   2,645.10x = 3,967.43 × 890.01
4. Step 4: Simplify right side
   2,645.10x = 3,531,047.92
5. Step 5: Solve for x
   x = 3,531,047.92/2,645.10
6. Step 6: Final answer
   x = 1,334.94