Finding the Fourth Proportional to 28,426.34, 42,620.42 and 13,627.16

Step by Step Solution

1. Step 1: Write the proportion equation
   28,426.34 : 42,620.42 = 13,627.16 : x
2. Step 2: Convert to fraction form
   28,426.34/42,620.42 = 13,627.16/x
3. Step 3: Cross multiply
   28,426.34x = 42,620.42 × 13,627.16
4. Step 4: Simplify right side
   28,426.34x = 580,795,282.61
5. Step 5: Solve for x
   x = 580,795,282.61/28,426.34
6. Step 6: Final answer
   x = 20,431.59