Finding the Fourth Proportional to 7,123.70, 9,830.22 and 4,290.53

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.70 : 9,830.22 = 4,290.53 : x
2. Step 2: Convert to fraction form
   7,123.70/9,830.22 = 4,290.53/x
3. Step 3: Cross multiply
   7,123.70x = 9,830.22 × 4,290.53
4. Step 4: Simplify right side
   7,123.70x = 42,176,804.67
5. Step 5: Solve for x
   x = 42,176,804.67/7,123.70
6. Step 6: Final answer
   x = 5,920.64