Finding the Fourth Proportional to 7,822.32, 10,787.79 and 5,172.42

Step by Step Solution

1. Step 1: Write the proportion equation
   7,822.32 : 10,787.79 = 5,172.42 : x
2. Step 2: Convert to fraction form
   7,822.32/10,787.79 = 5,172.42/x
3. Step 3: Cross multiply
   7,822.32x = 10,787.79 × 5,172.42
4. Step 4: Simplify right side
   7,822.32x = 55,798,980.75
5. Step 5: Solve for x
   x = 55,798,980.75/7,822.32
6. Step 6: Final answer
   x = 7,133.30