Finding the Fourth Proportional to 42,090.36, 63,144.18 and 12,505.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,090.36 : 63,144.18 = 12,505.56 : x
2. Step 2: Convert to fraction form
   42,090.36/63,144.18 = 12,505.56/x
3. Step 3: Cross multiply
   42,090.36x = 63,144.18 × 12,505.56
4. Step 4: Simplify right side
   42,090.36x = 789,653,331.64
5. Step 5: Solve for x
   x = 789,653,331.64/42,090.36
6. Step 6: Final answer
   x = 18,760.91