Finding the Fourth Proportional to 42,982.72, 64,390.21 and 28,146.66

Step by Step Solution

1. Step 1: Write the proportion equation
   42,982.72 : 64,390.21 = 28,146.66 : x
2. Step 2: Convert to fraction form
   42,982.72/64,390.21 = 28,146.66/x
3. Step 3: Cross multiply
   42,982.72x = 64,390.21 × 28,146.66
4. Step 4: Simplify right side
   42,982.72x = 1,812,369,348.20
5. Step 5: Solve for x
   x = 1,812,369,348.20/42,982.72
6. Step 6: Final answer
   x = 42,165.07