Finding the Fourth Proportional to 28,440.06, 42,665.16 and 9,722.18

Step by Step Solution

1. Step 1: Write the proportion equation
   28,440.06 : 42,665.16 = 9,722.18 : x
2. Step 2: Convert to fraction form
   28,440.06/42,665.16 = 9,722.18/x
3. Step 3: Cross multiply
   28,440.06x = 42,665.16 × 9,722.18
4. Step 4: Simplify right side
   28,440.06x = 414,798,151.92
5. Step 5: Solve for x
   x = 414,798,151.92/28,440.06
6. Step 6: Final answer
   x = 14,585.00