Finding the Fourth Proportional to 42,982.35, 64,389.65 and 28,146.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,982.35 : 64,389.65 = 28,146.28 : x
2. Step 2: Convert to fraction form
   42,982.35/64,389.65 = 28,146.28/x
3. Step 3: Cross multiply
   42,982.35x = 64,389.65 × 28,146.28
4. Step 4: Simplify right side
   42,982.35x = 1,812,329,253.91
5. Step 5: Solve for x
   x = 1,812,329,253.91/42,982.35
6. Step 6: Final answer
   x = 42,164.50