Finding the Fourth Proportional to 10,386.50, 15,584.31 and 5,454.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,386.50 : 15,584.31 = 5,454.99 : x
2. Step 2: Convert to fraction form
   10,386.50/15,584.31 = 5,454.99/x
3. Step 3: Cross multiply
   10,386.50x = 15,584.31 × 5,454.99
4. Step 4: Simplify right side
   10,386.50x = 85,012,255.21
5. Step 5: Solve for x
   x = 85,012,255.21/10,386.50
6. Step 6: Final answer
   x = 8,184.88