Finding the Fourth Proportional to 2,123.63, 3,185.50 and 807.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.63 : 3,185.50 = 807.22 : x
2. Step 2: Convert to fraction form
   2,123.63/3,185.50 = 807.22/x
3. Step 3: Cross multiply
   2,123.63x = 3,185.50 × 807.22
4. Step 4: Simplify right side
   2,123.63x = 2,571,387.14
5. Step 5: Solve for x
   x = 2,571,387.14/2,123.63
6. Step 6: Final answer
   x = 1,210.85