Finding the Fourth Proportional to 42,443.70, 63,912.17 and 31,428.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,443.70 : 63,912.17 = 31,428.42 : x
2. Step 2: Convert to fraction form
   42,443.70/63,912.17 = 31,428.42/x
3. Step 3: Cross multiply
   42,443.70x = 63,912.17 × 31,428.42
4. Step 4: Simplify right side
   42,443.70x = 2,008,658,364.73
5. Step 5: Solve for x
   x = 2,008,658,364.73/42,443.70
6. Step 6: Final answer
   x = 47,325.24