Finding the Fourth Proportional to 6,145.29, 8,453.11 and 5,385.31

Step by Step Solution

1. Step 1: Write the proportion equation
   6,145.29 : 8,453.11 = 5,385.31 : x
2. Step 2: Convert to fraction form
   6,145.29/8,453.11 = 5,385.31/x
3. Step 3: Cross multiply
   6,145.29x = 8,453.11 × 5,385.31
4. Step 4: Simplify right side
   6,145.29x = 45,522,617.81
5. Step 5: Solve for x
   x = 45,522,617.81/6,145.29
6. Step 6: Final answer
   x = 7,407.72