Finding the Fourth Proportional to 28,149.47, 42,230.23 and 10,380.18

Step by Step Solution

1. Step 1: Write the proportion equation
   28,149.47 : 42,230.23 = 10,380.18 : x
2. Step 2: Convert to fraction form
   28,149.47/42,230.23 = 10,380.18/x
3. Step 3: Cross multiply
   28,149.47x = 42,230.23 × 10,380.18
4. Step 4: Simplify right side
   28,149.47x = 438,357,362.89
5. Step 5: Solve for x
   x = 438,357,362.89/28,149.47
6. Step 6: Final answer
   x = 15,572.49