Finding the Fourth Proportional to 9,050.72, 12,489.47 and 5,274.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,050.72 : 12,489.47 = 5,274.50 : x
2. Step 2: Convert to fraction form
   9,050.72/12,489.47 = 5,274.50/x
3. Step 3: Cross multiply
   9,050.72x = 12,489.47 × 5,274.50
4. Step 4: Simplify right side
   9,050.72x = 65,875,620.70
5. Step 5: Solve for x
   x = 65,875,620.70/9,050.72
6. Step 6: Final answer
   x = 7,278.50