Finding the Fourth Proportional to 28,388.32, 42,563.94 and 13,596.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,388.32 : 42,563.94 = 13,596.76 : x
2. Step 2: Convert to fraction form
   28,388.32/42,563.94 = 13,596.76/x
3. Step 3: Cross multiply
   28,388.32x = 42,563.94 × 13,596.76
4. Step 4: Simplify right side
   28,388.32x = 578,731,676.83
5. Step 5: Solve for x
   x = 578,731,676.83/28,388.32
6. Step 6: Final answer
   x = 20,386.26