Finding the Fourth Proportional to 2,547.41, 3,820.31 and 987.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.41 : 3,820.31 = 987.31 : x
2. Step 2: Convert to fraction form
   2,547.41/3,820.31 = 987.31/x
3. Step 3: Cross multiply
   2,547.41x = 3,820.31 × 987.31
4. Step 4: Simplify right side
   2,547.41x = 3,771,806.23
5. Step 5: Solve for x
   x = 3,771,806.23/2,547.41
6. Step 6: Final answer
   x = 1,480.64