Finding the Fourth Proportional to 2,386.32, 3,580.05 and 998.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.32 : 3,580.05 = 998.88 : x
2. Step 2: Convert to fraction form
   2,386.32/3,580.05 = 998.88/x
3. Step 3: Cross multiply
   2,386.32x = 3,580.05 × 998.88
4. Step 4: Simplify right side
   2,386.32x = 3,576,040.34
5. Step 5: Solve for x
   x = 3,576,040.34/2,386.32
6. Step 6: Final answer
   x = 1,498.56