Finding the Fourth Proportional to 28,300.83, 42,450.80 and 7,240.67

Step by Step Solution

1. Step 1: Write the proportion equation
   28,300.83 : 42,450.80 = 7,240.67 : x
2. Step 2: Convert to fraction form
   28,300.83/42,450.80 = 7,240.67/x
3. Step 3: Cross multiply
   28,300.83x = 42,450.80 × 7,240.67
4. Step 4: Simplify right side
   28,300.83x = 307,372,424.28
5. Step 5: Solve for x
   x = 307,372,424.28/28,300.83
6. Step 6: Final answer
   x = 10,860.90