Finding the Fourth Proportional to 28,665.16, 42,941.81 and 18,774.45

Step by Step Solution

1. Step 1: Write the proportion equation
   28,665.16 : 42,941.81 = 18,774.45 : x
2. Step 2: Convert to fraction form
   28,665.16/42,941.81 = 18,774.45/x
3. Step 3: Cross multiply
   28,665.16x = 42,941.81 × 18,774.45
4. Step 4: Simplify right side
   28,665.16x = 806,208,911.69
5. Step 5: Solve for x
   x = 806,208,911.69/28,665.16
6. Step 6: Final answer
   x = 28,125.05