Finding the Fourth Proportional to 39,196.69, 54,090.53 and 21,291.30

Step by Step Solution

1. Step 1: Write the proportion equation
   39,196.69 : 54,090.53 = 21,291.30 : x
2. Step 2: Convert to fraction form
   39,196.69/54,090.53 = 21,291.30/x
3. Step 3: Cross multiply
   39,196.69x = 54,090.53 × 21,291.30
4. Step 4: Simplify right side
   39,196.69x = 1,151,657,324.48
5. Step 5: Solve for x
   x = 1,151,657,324.48/39,196.69
6. Step 6: Final answer
   x = 29,381.49