Finding the Fourth Proportional to 42,678.78, 64,016.55 and 11,514.84

Step by Step Solution

1. Step 1: Write the proportion equation
   42,678.78 : 64,016.55 = 11,514.84 : x
2. Step 2: Convert to fraction form
   42,678.78/64,016.55 = 11,514.84/x
3. Step 3: Cross multiply
   42,678.78x = 64,016.55 × 11,514.84
4. Step 4: Simplify right side
   42,678.78x = 737,140,330.60
5. Step 5: Solve for x
   x = 737,140,330.60/42,678.78
6. Step 6: Final answer
   x = 17,271.82