Finding the Fourth Proportional to 1,003.41, 1,390.25 and 987.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.41 : 1,390.25 = 987.62 : x
2. Step 2: Convert to fraction form
   1,003.41/1,390.25 = 987.62/x
3. Step 3: Cross multiply
   1,003.41x = 1,390.25 × 987.62
4. Step 4: Simplify right side
   1,003.41x = 1,373,034.22
5. Step 5: Solve for x
   x = 1,373,034.22/1,003.41
6. Step 6: Final answer
   x = 1,368.37