Finding the Fourth Proportional to 2,988.38, 4,484.39 and 1,257

Step by Step Solution

1. Step 1: Write the proportion equation
   2,988.38 : 4,484.39 = 1,257 : x
2. Step 2: Convert to fraction form
   2,988.38/4,484.39 = 1,257/x
3. Step 3: Cross multiply
   2,988.38x = 4,484.39 × 1,257
4. Step 4: Simplify right side
   2,988.38x = 5,636,871.95
5. Step 5: Solve for x
   x = 5,636,871.95/2,988.38
6. Step 6: Final answer
   x = 1,886.27