Finding the Fourth Proportional to 9,300.58, 12,839.80 and 7,171.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,300.58 : 12,839.80 = 7,171.43 : x
2. Step 2: Convert to fraction form
   9,300.58/12,839.80 = 7,171.43/x
3. Step 3: Cross multiply
   9,300.58x = 12,839.80 × 7,171.43
4. Step 4: Simplify right side
   9,300.58x = 92,079,726.91
5. Step 5: Solve for x
   x = 92,079,726.91/9,300.58
6. Step 6: Final answer
   x = 9,900.43