Finding the Fourth Proportional to 39,066.34, 53,911.52 and 21,161.31

Step by Step Solution

1. Step 1: Write the proportion equation
   39,066.34 : 53,911.52 = 21,161.31 : x
2. Step 2: Convert to fraction form
   39,066.34/53,911.52 = 21,161.31/x
3. Step 3: Cross multiply
   39,066.34x = 53,911.52 × 21,161.31
4. Step 4: Simplify right side
   39,066.34x = 1,140,838,387.29
5. Step 5: Solve for x
   x = 1,140,838,387.29/39,066.34
6. Step 6: Final answer
   x = 29,202.59