Finding the Fourth Proportional to 28,298.67, 42,457.20 and 13,505.67

Step by Step Solution

1. Step 1: Write the proportion equation
   28,298.67 : 42,457.20 = 13,505.67 : x
2. Step 2: Convert to fraction form
   28,298.67/42,457.20 = 13,505.67/x
3. Step 3: Cross multiply
   28,298.67x = 42,457.20 × 13,505.67
4. Step 4: Simplify right side
   28,298.67x = 573,412,932.32
5. Step 5: Solve for x
   x = 573,412,932.32/28,298.67
6. Step 6: Final answer
   x = 20,262.89