Finding the Fourth Proportional to 42,928.42, 64,382.79 and 11,766.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,928.42 : 64,382.79 = 11,766.10 : x
2. Step 2: Convert to fraction form
   42,928.42/64,382.79 = 11,766.10/x
3. Step 3: Cross multiply
   42,928.42x = 64,382.79 × 11,766.10
4. Step 4: Simplify right side
   42,928.42x = 757,534,345.42
5. Step 5: Solve for x
   x = 757,534,345.42/42,928.42
6. Step 6: Final answer
   x = 17,646.45