Finding the Fourth Proportional to 7,485.72, 10,330.52 and 4,128.76

Step by Step Solution

1. Step 1: Write the proportion equation
   7,485.72 : 10,330.52 = 4,128.76 : x
2. Step 2: Convert to fraction form
   7,485.72/10,330.52 = 4,128.76/x
3. Step 3: Cross multiply
   7,485.72x = 10,330.52 × 4,128.76
4. Step 4: Simplify right side
   7,485.72x = 42,652,237.76
5. Step 5: Solve for x
   x = 42,652,237.76/7,485.72
6. Step 6: Final answer
   x = 5,697.81