Finding the Fourth Proportional to 5,415.48, 8,128.27 and 3,339.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,415.48 : 8,128.27 = 3,339.50 : x
2. Step 2: Convert to fraction form
   5,415.48/8,128.27 = 3,339.50/x
3. Step 3: Cross multiply
   5,415.48x = 8,128.27 × 3,339.50
4. Step 4: Simplify right side
   5,415.48x = 27,144,399.17
5. Step 5: Solve for x
   x = 27,144,399.17/5,415.48
6. Step 6: Final answer
   x = 5,012.37