Finding the Fourth Proportional to 13,347.69, 20,057.90 and 7,112.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,347.69 : 20,057.90 = 7,112.15 : x
2. Step 2: Convert to fraction form
   13,347.69/20,057.90 = 7,112.15/x
3. Step 3: Cross multiply
   13,347.69x = 20,057.90 × 7,112.15
4. Step 4: Simplify right side
   13,347.69x = 142,654,905.69
5. Step 5: Solve for x
   x = 142,654,905.69/13,347.69
6. Step 6: Final answer
   x = 10,687.61