Finding the Fourth Proportional to 1,985.29, 2,977.89 and 686.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.29 : 2,977.89 = 686.72 : x
2. Step 2: Convert to fraction form
   1,985.29/2,977.89 = 686.72/x
3. Step 3: Cross multiply
   1,985.29x = 2,977.89 × 686.72
4. Step 4: Simplify right side
   1,985.29x = 2,044,976.62
5. Step 5: Solve for x
   x = 2,044,976.62/1,985.29
6. Step 6: Final answer
   x = 1,030.07