Finding the Fourth Proportional to 42,689.78, 64,017.39 and 18,048.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,689.78 : 64,017.39 = 18,048.50 : x
2. Step 2: Convert to fraction form
   42,689.78/64,017.39 = 18,048.50/x
3. Step 3: Cross multiply
   42,689.78x = 64,017.39 × 18,048.50
4. Step 4: Simplify right side
   42,689.78x = 1,155,417,863.42
5. Step 5: Solve for x
   x = 1,155,417,863.42/42,689.78
6. Step 6: Final answer
   x = 27,065.44