Finding the Fourth Proportional to 10,390.98, 15,578.27 and 5,457.93

Step by Step Solution

1. Step 1: Write the proportion equation
   10,390.98 : 15,578.27 = 5,457.93 : x
2. Step 2: Convert to fraction form
   10,390.98/15,578.27 = 5,457.93/x
3. Step 3: Cross multiply
   10,390.98x = 15,578.27 × 5,457.93
4. Step 4: Simplify right side
   10,390.98x = 85,025,160.27
5. Step 5: Solve for x
   x = 85,025,160.27/10,390.98
6. Step 6: Final answer
   x = 8,182.59