Finding the Fourth Proportional to 7,485.10, 10,329.51 and 4,128.05

Step by Step Solution

1. Step 1: Write the proportion equation
   7,485.10 : 10,329.51 = 4,128.05 : x
2. Step 2: Convert to fraction form
   7,485.10/10,329.51 = 4,128.05/x
3. Step 3: Cross multiply
   7,485.10x = 10,329.51 × 4,128.05
4. Step 4: Simplify right side
   7,485.10x = 42,640,733.76
5. Step 5: Solve for x
   x = 42,640,733.76/7,485.10
6. Step 6: Final answer
   x = 5,696.75