Finding the Fourth Proportional to 7,123.77, 9,830.52 and 4,139.46

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.77 : 9,830.52 = 4,139.46 : x
2. Step 2: Convert to fraction form
   7,123.77/9,830.52 = 4,139.46/x
3. Step 3: Cross multiply
   7,123.77x = 9,830.52 × 4,139.46
4. Step 4: Simplify right side
   7,123.77x = 40,693,044.32
5. Step 5: Solve for x
   x = 40,693,044.32/7,123.77
6. Step 6: Final answer
   x = 5,712.29