Finding the Fourth Proportional to 20,945.53, 31,415.05 and 13,602.07

Step by Step Solution

1. Step 1: Write the proportion equation
   20,945.53 : 31,415.05 = 13,602.07 : x
2. Step 2: Convert to fraction form
   20,945.53/31,415.05 = 13,602.07/x
3. Step 3: Cross multiply
   20,945.53x = 31,415.05 × 13,602.07
4. Step 4: Simplify right side
   20,945.53x = 427,309,709.15
5. Step 5: Solve for x
   x = 427,309,709.15/20,945.53
6. Step 6: Final answer
   x = 20,401.00