Finding the Fourth Proportional to 7,485.90, 10,330.49 and 4,128.86

Step by Step Solution

1. Step 1: Write the proportion equation
   7,485.90 : 10,330.49 = 4,128.86 : x
2. Step 2: Convert to fraction form
   7,485.90/10,330.49 = 4,128.86/x
3. Step 3: Cross multiply
   7,485.90x = 10,330.49 × 4,128.86
4. Step 4: Simplify right side
   7,485.90x = 42,653,101.76
5. Step 5: Solve for x
   x = 42,653,101.76/7,485.90
6. Step 6: Final answer
   x = 5,697.79