Finding the Fourth Proportional to 5,264.26, 7,890.72 and 2,667.40

Step by Step Solution

1. Step 1: Write the proportion equation
   5,264.26 : 7,890.72 = 2,667.40 : x
2. Step 2: Convert to fraction form
   5,264.26/7,890.72 = 2,667.40/x
3. Step 3: Cross multiply
   5,264.26x = 7,890.72 × 2,667.40
4. Step 4: Simplify right side
   5,264.26x = 21,047,706.53
5. Step 5: Solve for x
   x = 21,047,706.53/5,264.26
6. Step 6: Final answer
   x = 3,998.23