Finding the Fourth Proportional to 28,090.47, 42,109.67 and 10,571.91

Step by Step Solution

1. Step 1: Write the proportion equation
   28,090.47 : 42,109.67 = 10,571.91 : x
2. Step 2: Convert to fraction form
   28,090.47/42,109.67 = 10,571.91/x
3. Step 3: Cross multiply
   28,090.47x = 42,109.67 × 10,571.91
4. Step 4: Simplify right side
   28,090.47x = 445,179,588.51
5. Step 5: Solve for x
   x = 445,179,588.51/28,090.47
6. Step 6: Final answer
   x = 15,848.06