Finding the Fourth Proportional to 3,667.78, 5,061.52 and 1,989.23

Step by Step Solution

1. Step 1: Write the proportion equation
   3,667.78 : 5,061.52 = 1,989.23 : x
2. Step 2: Convert to fraction form
   3,667.78/5,061.52 = 1,989.23/x
3. Step 3: Cross multiply
   3,667.78x = 5,061.52 × 1,989.23
4. Step 4: Simplify right side
   3,667.78x = 10,068,492.18
5. Step 5: Solve for x
   x = 10,068,492.18/3,667.78
6. Step 6: Final answer
   x = 2,745.12