Finding the Fourth Proportional to 42,992.68, 64,139.92 and 40,667.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,992.68 : 64,139.92 = 40,667.56 : x
2. Step 2: Convert to fraction form
   42,992.68/64,139.92 = 40,667.56/x
3. Step 3: Cross multiply
   42,992.68x = 64,139.92 × 40,667.56
4. Step 4: Simplify right side
   42,992.68x = 2,608,414,045.00
5. Step 5: Solve for x
   x = 2,608,414,045.00/42,992.68
6. Step 6: Final answer
   x = 60,671.12