Finding the Fourth Proportional to 39,036.66, 53,870.56 and 21,131.82

Step by Step Solution

1. Step 1: Write the proportion equation
   39,036.66 : 53,870.56 = 21,131.82 : x
2. Step 2: Convert to fraction form
   39,036.66/53,870.56 = 21,131.82/x
3. Step 3: Cross multiply
   39,036.66x = 53,870.56 × 21,131.82
4. Step 4: Simplify right side
   39,036.66x = 1,138,382,977.22
5. Step 5: Solve for x
   x = 1,138,382,977.22/39,036.66
6. Step 6: Final answer
   x = 29,161.89