Finding the Fourth Proportional to 2,123.54, 3,185.02 and 807.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.54 : 3,185.02 = 807.63 : x
2. Step 2: Convert to fraction form
   2,123.54/3,185.02 = 807.63/x
3. Step 3: Cross multiply
   2,123.54x = 3,185.02 × 807.63
4. Step 4: Simplify right side
   2,123.54x = 2,572,303.80
5. Step 5: Solve for x
   x = 2,572,303.80/2,123.54
6. Step 6: Final answer
   x = 1,211.33