Finding the Fourth Proportional to 1,003.89, 1,506.30 and 987.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.89 : 1,506.30 = 987.49 : x
2. Step 2: Convert to fraction form
   1,003.89/1,506.30 = 987.49/x
3. Step 3: Cross multiply
   1,003.89x = 1,506.30 × 987.49
4. Step 4: Simplify right side
   1,003.89x = 1,487,454.37
5. Step 5: Solve for x
   x = 1,487,454.37/1,003.89
6. Step 6: Final answer
   x = 1,481.69