Finding the Fourth Proportional to 2,645.06, 3,967.89 and 889.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.06 : 3,967.89 = 889.99 : x
2. Step 2: Convert to fraction form
   2,645.06/3,967.89 = 889.99/x
3. Step 3: Cross multiply
   2,645.06x = 3,967.89 × 889.99
4. Step 4: Simplify right side
   2,645.06x = 3,531,369.16
5. Step 5: Solve for x
   x = 3,531,369.16/2,645.06
6. Step 6: Final answer
   x = 1,335.08