Finding the Fourth Proportional to 2,427.58, 3,638.32 and 1,039.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,427.58 : 3,638.32 = 1,039.28 : x
2. Step 2: Convert to fraction form
   2,427.58/3,638.32 = 1,039.28/x
3. Step 3: Cross multiply
   2,427.58x = 3,638.32 × 1,039.28
4. Step 4: Simplify right side
   2,427.58x = 3,781,209.82
5. Step 5: Solve for x
   x = 3,781,209.82/2,427.58
6. Step 6: Final answer
   x = 1,557.60