Finding the Fourth Proportional to 3,453.42, 5,179.32 and 987.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,453.42 : 5,179.32 = 987.78 : x
2. Step 2: Convert to fraction form
   3,453.42/5,179.32 = 987.78/x
3. Step 3: Cross multiply
   3,453.42x = 5,179.32 × 987.78
4. Step 4: Simplify right side
   3,453.42x = 5,116,028.71
5. Step 5: Solve for x
   x = 5,116,028.71/3,453.42
6. Step 6: Final answer
   x = 1,481.44