Finding the Fourth Proportional to 39,036.50, 53,870.54 and 21,131.51

Step by Step Solution

1. Step 1: Write the proportion equation
   39,036.50 : 53,870.54 = 21,131.51 : x
2. Step 2: Convert to fraction form
   39,036.50/53,870.54 = 21,131.51/x
3. Step 3: Cross multiply
   39,036.50x = 53,870.54 × 21,131.51
4. Step 4: Simplify right side
   39,036.50x = 1,138,365,479.71
5. Step 5: Solve for x
   x = 1,138,365,479.71/39,036.50
6. Step 6: Final answer
   x = 29,161.57