Finding the Fourth Proportional to 1,686.02, 2,530.32 and 864.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.02 : 2,530.32 = 864.22 : x
2. Step 2: Convert to fraction form
   1,686.02/2,530.32 = 864.22/x
3. Step 3: Cross multiply
   1,686.02x = 2,530.32 × 864.22
4. Step 4: Simplify right side
   1,686.02x = 2,186,753.15
5. Step 5: Solve for x
   x = 2,186,753.15/1,686.02
6. Step 6: Final answer
   x = 1,296.99