Finding the Fourth Proportional to 42,728.96, 64,096.80 and 14,662.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,728.96 : 64,096.80 = 14,662.40 : x
2. Step 2: Convert to fraction form
   42,728.96/64,096.80 = 14,662.40/x
3. Step 3: Cross multiply
   42,728.96x = 64,096.80 × 14,662.40
4. Step 4: Simplify right side
   42,728.96x = 939,812,920.32
5. Step 5: Solve for x
   x = 939,812,920.32/42,728.96
6. Step 6: Final answer
   x = 21,994.75