Finding the Fourth Proportional to 3,587.02, 5,380.65 and 989.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,587.02 : 5,380.65 = 989.98 : x
2. Step 2: Convert to fraction form
   3,587.02/5,380.65 = 989.98/x
3. Step 3: Cross multiply
   3,587.02x = 5,380.65 × 989.98
4. Step 4: Simplify right side
   3,587.02x = 5,326,735.89
5. Step 5: Solve for x
   x = 5,326,735.89/3,587.02
6. Step 6: Final answer
   x = 1,485.00