Finding the Fourth Proportional to 2,667.20, 3,977.47 and 2,521.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.20 : 3,977.47 = 2,521.63 : x
2. Step 2: Convert to fraction form
   2,667.20/3,977.47 = 2,521.63/x
3. Step 3: Cross multiply
   2,667.20x = 3,977.47 × 2,521.63
4. Step 4: Simplify right side
   2,667.20x = 10,029,675.18
5. Step 5: Solve for x
   x = 10,029,675.18/2,667.20
6. Step 6: Final answer
   x = 3,760.38