Finding the Fourth Proportional to 1,684.80, 2,523.15 and 818.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,684.80 : 2,523.15 = 818.10 : x
2. Step 2: Convert to fraction form
   1,684.80/2,523.15 = 818.10/x
3. Step 3: Cross multiply
   1,684.80x = 2,523.15 × 818.10
4. Step 4: Simplify right side
   1,684.80x = 2,064,189.02
5. Step 5: Solve for x
   x = 2,064,189.02/1,684.80
6. Step 6: Final answer
   x = 1,225.18