Finding the Fourth Proportional to 4,920.72, 7,380.72 and 1,458

Step by Step Solution

1. Step 1: Write the proportion equation
   4,920.72 : 7,380.72 = 1,458 : x
2. Step 2: Convert to fraction form
   4,920.72/7,380.72 = 1,458/x
3. Step 3: Cross multiply
   4,920.72x = 7,380.72 × 1,458
4. Step 4: Simplify right side
   4,920.72x = 10,761,089.76
5. Step 5: Solve for x
   x = 10,761,089.76/4,920.72
6. Step 6: Final answer
   x = 2,186.89