Finding the Fourth Proportional to 1,387.38, 2,080.69 and 684.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.38 : 2,080.69 = 684.25 : x
2. Step 2: Convert to fraction form
   1,387.38/2,080.69 = 684.25/x
3. Step 3: Cross multiply
   1,387.38x = 2,080.69 × 684.25
4. Step 4: Simplify right side
   1,387.38x = 1,423,705.22
5. Step 5: Solve for x
   x = 1,423,705.22/1,387.38
6. Step 6: Final answer
   x = 1,026.18