Finding the Fourth Proportional to 3,978.78, 5,488.45 and 2,484.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.78 : 5,488.45 = 2,484.87 : x
2. Step 2: Convert to fraction form
   3,978.78/5,488.45 = 2,484.87/x
3. Step 3: Cross multiply
   3,978.78x = 5,488.45 × 2,484.87
4. Step 4: Simplify right side
   3,978.78x = 13,638,084.75
5. Step 5: Solve for x
   x = 13,638,084.75/3,978.78
6. Step 6: Final answer
   x = 3,427.71