Finding the Fourth Proportional to 2,123.10, 3,186.06 and 808.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.10 : 3,186.06 = 808.07 : x
2. Step 2: Convert to fraction form
   2,123.10/3,186.06 = 808.07/x
3. Step 3: Cross multiply
   2,123.10x = 3,186.06 × 808.07
4. Step 4: Simplify right side
   2,123.10x = 2,574,543.57
5. Step 5: Solve for x
   x = 2,574,543.57/2,123.10
6. Step 6: Final answer
   x = 1,212.63