Finding the Fourth Proportional to 39,050.16, 53,889.47 and 21,145.31

Step by Step Solution

1. Step 1: Write the proportion equation
   39,050.16 : 53,889.47 = 21,145.31 : x
2. Step 2: Convert to fraction form
   39,050.16/53,889.47 = 21,145.31/x
3. Step 3: Cross multiply
   39,050.16x = 53,889.47 × 21,145.31
4. Step 4: Simplify right side
   39,050.16x = 1,139,509,548.89
5. Step 5: Solve for x
   x = 1,139,509,548.89/39,050.16
6. Step 6: Final answer
   x = 29,180.66