Finding the Fourth Proportional to 7,485.87, 10,330.58 and 4,128.81

Step by Step Solution

1. Step 1: Write the proportion equation
   7,485.87 : 10,330.58 = 4,128.81 : x
2. Step 2: Convert to fraction form
   7,485.87/10,330.58 = 4,128.81/x
3. Step 3: Cross multiply
   7,485.87x = 10,330.58 × 4,128.81
4. Step 4: Simplify right side
   7,485.87x = 42,653,002.01
5. Step 5: Solve for x
   x = 42,653,002.01/7,485.87
6. Step 6: Final answer
   x = 5,697.80