Finding the Fourth Proportional to 7,152.78, 10,728.78 and 1,958.28

Step by Step Solution

1. Step 1: Write the proportion equation
   7,152.78 : 10,728.78 = 1,958.28 : x
2. Step 2: Convert to fraction form
   7,152.78/10,728.78 = 1,958.28/x
3. Step 3: Cross multiply
   7,152.78x = 10,728.78 × 1,958.28
4. Step 4: Simplify right side
   7,152.78x = 21,009,955.30
5. Step 5: Solve for x
   x = 21,009,955.30/7,152.78
6. Step 6: Final answer
   x = 2,937.31