Finding the Fourth Proportional to 39,051.79, 53,891.72 and 21,146.79

Step by Step Solution

1. Step 1: Write the proportion equation
   39,051.79 : 53,891.72 = 21,146.79 : x
2. Step 2: Convert to fraction form
   39,051.79/53,891.72 = 21,146.79/x
3. Step 3: Cross multiply
   39,051.79x = 53,891.72 × 21,146.79
4. Step 4: Simplify right side
   39,051.79x = 1,139,636,885.58
5. Step 5: Solve for x
   x = 1,139,636,885.58/39,051.79
6. Step 6: Final answer
   x = 29,182.71