Finding the Fourth Proportional to 2,547.72, 3,819.56 and 987.66

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.72 : 3,819.56 = 987.66 : x
2. Step 2: Convert to fraction form
   2,547.72/3,819.56 = 987.66/x
3. Step 3: Cross multiply
   2,547.72x = 3,819.56 × 987.66
4. Step 4: Simplify right side
   2,547.72x = 3,772,421.69
5. Step 5: Solve for x
   x = 3,772,421.69/2,547.72
6. Step 6: Final answer
   x = 1,480.70