Finding the Fourth Proportional to 7,845.32, 10,821.90 and 5,357

Step by Step Solution

1. Step 1: Write the proportion equation
   7,845.32 : 10,821.90 = 5,357 : x
2. Step 2: Convert to fraction form
   7,845.32/10,821.90 = 5,357/x
3. Step 3: Cross multiply
   7,845.32x = 10,821.90 × 5,357
4. Step 4: Simplify right side
   7,845.32x = 57,972,918.30
5. Step 5: Solve for x
   x = 57,972,918.30/7,845.32
6. Step 6: Final answer
   x = 7,389.49