Finding the Fourth Proportional to 3,454.42, 5,180.85 and 988.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,454.42 : 5,180.85 = 988.72 : x
2. Step 2: Convert to fraction form
   3,454.42/5,180.85 = 988.72/x
3. Step 3: Cross multiply
   3,454.42x = 5,180.85 × 988.72
4. Step 4: Simplify right side
   3,454.42x = 5,122,410.01
5. Step 5: Solve for x
   x = 5,122,410.01/3,454.42
6. Step 6: Final answer
   x = 1,482.86