Finding the Fourth Proportional to 39,105.47, 53,965.61 and 21,200.47

Step by Step Solution

1. Step 1: Write the proportion equation
   39,105.47 : 53,965.61 = 21,200.47 : x
2. Step 2: Convert to fraction form
   39,105.47/53,965.61 = 21,200.47/x
3. Step 3: Cross multiply
   39,105.47x = 53,965.61 × 21,200.47
4. Step 4: Simplify right side
   39,105.47x = 1,144,096,189.83
5. Step 5: Solve for x
   x = 1,144,096,189.83/39,105.47
6. Step 6: Final answer
   x = 29,256.68