Finding the Fourth Proportional to 2,547.98, 3,822.78 and 988.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.98 : 3,822.78 = 988.64 : x
2. Step 2: Convert to fraction form
   2,547.98/3,822.78 = 988.64/x
3. Step 3: Cross multiply
   2,547.98x = 3,822.78 × 988.64
4. Step 4: Simplify right side
   2,547.98x = 3,779,353.22
5. Step 5: Solve for x
   x = 3,779,353.22/2,547.98
6. Step 6: Final answer
   x = 1,483.27