Finding the Fourth Proportional to 42,688.96, 64,041.72 and 16,391.68

Step by Step Solution

1. Step 1: Write the proportion equation
   42,688.96 : 64,041.72 = 16,391.68 : x
2. Step 2: Convert to fraction form
   42,688.96/64,041.72 = 16,391.68/x
3. Step 3: Cross multiply
   42,688.96x = 64,041.72 × 16,391.68
4. Step 4: Simplify right side
   42,688.96x = 1,049,751,380.89
5. Step 5: Solve for x
   x = 1,049,751,380.89/42,688.96
6. Step 6: Final answer
   x = 24,590.70