Finding the Fourth Proportional to 7,485.71, 10,330.29 and 4,128.45

Step by Step Solution

1. Step 1: Write the proportion equation
   7,485.71 : 10,330.29 = 4,128.45 : x
2. Step 2: Convert to fraction form
   7,485.71/10,330.29 = 4,128.45/x
3. Step 3: Cross multiply
   7,485.71x = 10,330.29 × 4,128.45
4. Step 4: Simplify right side
   7,485.71x = 42,648,085.75
5. Step 5: Solve for x
   x = 42,648,085.75/7,485.71
6. Step 6: Final answer
   x = 5,697.27