Finding the Fourth Proportional to 7,123.50, 9,830.43 and 3,979.98

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.50 : 9,830.43 = 3,979.98 : x
2. Step 2: Convert to fraction form
   7,123.50/9,830.43 = 3,979.98/x
3. Step 3: Cross multiply
   7,123.50x = 9,830.43 × 3,979.98
4. Step 4: Simplify right side
   7,123.50x = 39,124,914.79
5. Step 5: Solve for x
   x = 39,124,914.79/7,123.50
6. Step 6: Final answer
   x = 5,492.37