Finding the Fourth Proportional to 28,287.68, 42,436.71 and 9,313.40

Step by Step Solution

1. Step 1: Write the proportion equation
   28,287.68 : 42,436.71 = 9,313.40 : x
2. Step 2: Convert to fraction form
   28,287.68/42,436.71 = 9,313.40/x
3. Step 3: Cross multiply
   28,287.68x = 42,436.71 × 9,313.40
4. Step 4: Simplify right side
   28,287.68x = 395,229,922.30
5. Step 5: Solve for x
   x = 395,229,922.30/28,287.68
6. Step 6: Final answer
   x = 13,971.80