Finding the Fourth Proportional to 39,012.10, 53,836.71 and 21,107.10

Step by Step Solution

1. Step 1: Write the proportion equation
   39,012.10 : 53,836.71 = 21,107.10 : x
2. Step 2: Convert to fraction form
   39,012.10/53,836.71 = 21,107.10/x
3. Step 3: Cross multiply
   39,012.10x = 53,836.71 × 21,107.10
4. Step 4: Simplify right side
   39,012.10x = 1,136,336,552.46
5. Step 5: Solve for x
   x = 1,136,336,552.46/39,012.10
6. Step 6: Final answer
   x = 29,127.80