Finding the Fourth Proportional to 42,724.89, 64,126.71 and 21,679.70

Step by Step Solution

1. Step 1: Write the proportion equation
   42,724.89 : 64,126.71 = 21,679.70 : x
2. Step 2: Convert to fraction form
   42,724.89/64,126.71 = 21,679.70/x
3. Step 3: Cross multiply
   42,724.89x = 64,126.71 × 21,679.70
4. Step 4: Simplify right side
   42,724.89x = 1,390,247,514.15
5. Step 5: Solve for x
   x = 1,390,247,514.15/42,724.89
6. Step 6: Final answer
   x = 32,539.52