Finding the Fourth Proportional to 28,010.16, 42,021.77 and 12,429

Step by Step Solution

1. Step 1: Write the proportion equation
   28,010.16 : 42,021.77 = 12,429 : x
2. Step 2: Convert to fraction form
   28,010.16/42,021.77 = 12,429/x
3. Step 3: Cross multiply
   28,010.16x = 42,021.77 × 12,429
4. Step 4: Simplify right side
   28,010.16x = 522,288,517.19
5. Step 5: Solve for x
   x = 522,288,517.19/28,010.16
6. Step 6: Final answer
   x = 18,646.40