Finding the Fourth Proportional to 5,885.49, 8,121.61 and 5,415.29

Step by Step Solution

1. Step 1: Write the proportion equation
   5,885.49 : 8,121.61 = 5,415.29 : x
2. Step 2: Convert to fraction form
   5,885.49/8,121.61 = 5,415.29/x
3. Step 3: Cross multiply
   5,885.49x = 8,121.61 × 5,415.29
4. Step 4: Simplify right side
   5,885.49x = 43,980,870.03
5. Step 5: Solve for x
   x = 43,980,870.03/5,885.49
6. Step 6: Final answer
   x = 7,472.76