Finding the Fourth Proportional to 7,145.21, 9,860.53 and 4,276.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,145.21 : 9,860.53 = 4,276.89 : x
2. Step 2: Convert to fraction form
   7,145.21/9,860.53 = 4,276.89/x
3. Step 3: Cross multiply
   7,145.21x = 9,860.53 × 4,276.89
4. Step 4: Simplify right side
   7,145.21x = 42,172,380.77
5. Step 5: Solve for x
   x = 42,172,380.77/7,145.21
6. Step 6: Final answer
   x = 5,902.19