Finding the Fourth Proportional to 42,987.81, 64,506.78 and 18,025.94

Step by Step Solution

1. Step 1: Write the proportion equation
   42,987.81 : 64,506.78 = 18,025.94 : x
2. Step 2: Convert to fraction form
   42,987.81/64,506.78 = 18,025.94/x
3. Step 3: Cross multiply
   42,987.81x = 64,506.78 × 18,025.94
4. Step 4: Simplify right side
   42,987.81x = 1,162,795,507.14
5. Step 5: Solve for x
   x = 1,162,795,507.14/42,987.81
6. Step 6: Final answer
   x = 27,049.42