Finding the Fourth Proportional to 7,123.73, 9,828.56 and 4,139.00

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.73 : 9,828.56 = 4,139.00 : x
2. Step 2: Convert to fraction form
   7,123.73/9,828.56 = 4,139.00/x
3. Step 3: Cross multiply
   7,123.73x = 9,828.56 × 4,139.00
4. Step 4: Simplify right side
   7,123.73x = 40,680,340.00
5. Step 5: Solve for x
   x = 40,680,340.00/7,123.73
6. Step 6: Final answer
   x = 5,710.54