Finding the Fourth Proportional to 28,282.32, 42,435.72 and 13,491.36

Step by Step Solution

1. Step 1: Write the proportion equation
   28,282.32 : 42,435.72 = 13,491.36 : x
2. Step 2: Convert to fraction form
   28,282.32/42,435.72 = 13,491.36/x
3. Step 3: Cross multiply
   28,282.32x = 42,435.72 × 13,491.36
4. Step 4: Simplify right side
   28,282.32x = 572,515,575.38
5. Step 5: Solve for x
   x = 572,515,575.38/28,282.32
6. Step 6: Final answer
   x = 20,242.88