Finding the Fourth Proportional to 10,389.50, 15,588.82 and 5,458

Step by Step Solution

1. Step 1: Write the proportion equation
   10,389.50 : 15,588.82 = 5,458 : x
2. Step 2: Convert to fraction form
   10,389.50/15,588.82 = 5,458/x
3. Step 3: Cross multiply
   10,389.50x = 15,588.82 × 5,458
4. Step 4: Simplify right side
   10,389.50x = 85,083,779.56
5. Step 5: Solve for x
   x = 85,083,779.56/10,389.50
6. Step 6: Final answer
   x = 8,189.40