Finding the Fourth Proportional to 21,189.48, 31,761.54 and 13,400.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,189.48 : 31,761.54 = 13,400.52 : x
2. Step 2: Convert to fraction form
   21,189.48/31,761.54 = 13,400.52/x
3. Step 3: Cross multiply
   21,189.48x = 31,761.54 × 13,400.52
4. Step 4: Simplify right side
   21,189.48x = 425,621,152.00
5. Step 5: Solve for x
   x = 425,621,152.00/21,189.48
6. Step 6: Final answer
   x = 20,086.44