Finding the Fourth Proportional to 28,086.82, 42,125.37 and 15,405.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,086.82 : 42,125.37 = 15,405.10 : x
2. Step 2: Convert to fraction form
   28,086.82/42,125.37 = 15,405.10/x
3. Step 3: Cross multiply
   28,086.82x = 42,125.37 × 15,405.10
4. Step 4: Simplify right side
   28,086.82x = 648,945,537.39
5. Step 5: Solve for x
   x = 648,945,537.39/28,086.82
6. Step 6: Final answer
   x = 23,104.98