Finding the Fourth Proportional to 5,411.90, 8,124.87 and 5,189.81

Step by Step Solution

1. Step 1: Write the proportion equation
   5,411.90 : 8,124.87 = 5,189.81 : x
2. Step 2: Convert to fraction form
   5,411.90/8,124.87 = 5,189.81/x
3. Step 3: Cross multiply
   5,411.90x = 8,124.87 × 5,189.81
4. Step 4: Simplify right side
   5,411.90x = 42,166,551.89
5. Step 5: Solve for x
   x = 42,166,551.89/5,411.90
6. Step 6: Final answer
   x = 7,791.45