Finding the Fourth Proportional to 42,086.96, 63,128.26 and 12,505.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,086.96 : 63,128.26 = 12,505.04 : x
2. Step 2: Convert to fraction form
   42,086.96/63,128.26 = 12,505.04/x
3. Step 3: Cross multiply
   42,086.96x = 63,128.26 × 12,505.04
4. Step 4: Simplify right side
   42,086.96x = 789,421,416.43
5. Step 5: Solve for x
   x = 789,421,416.43/42,086.96
6. Step 6: Final answer
   x = 18,756.91