Finding the Fourth Proportional to 987.30, 1,479.89 and 743.07

Step by Step Solution

1. Step 1: Write the proportion equation
   987.30 : 1,479.89 = 743.07 : x
2. Step 2: Convert to fraction form
   987.30/1,479.89 = 743.07/x
3. Step 3: Cross multiply
   987.30x = 1,479.89 × 743.07
4. Step 4: Simplify right side
   987.30x = 1,099,654.46
5. Step 5: Solve for x
   x = 1,099,654.46/987.30
6. Step 6: Final answer
   x = 1,113.81