Finding the Fourth Proportional to 1,116.15, 1,539.31 and 673.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.15 : 1,539.31 = 673.89 : x
2. Step 2: Convert to fraction form
   1,116.15/1,539.31 = 673.89/x
3. Step 3: Cross multiply
   1,116.15x = 1,539.31 × 673.89
4. Step 4: Simplify right side
   1,116.15x = 1,037,325.62
5. Step 5: Solve for x
   x = 1,037,325.62/1,116.15
6. Step 6: Final answer
   x = 929.38