Finding the Fourth Proportional to 2,106.51, 3,157.89 and 808.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.51 : 3,157.89 = 808.89 : x
2. Step 2: Convert to fraction form
   2,106.51/3,157.89 = 808.89/x
3. Step 3: Cross multiply
   2,106.51x = 3,157.89 × 808.89
4. Step 4: Simplify right side
   2,106.51x = 2,554,370.77
5. Step 5: Solve for x
   x = 2,554,370.77/2,106.51
6. Step 6: Final answer
   x = 1,212.61