Finding the Fourth Proportional to 42,023.17, 63,043.98 and 12,443.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,023.17 : 63,043.98 = 12,443.31 : x
2. Step 2: Convert to fraction form
   42,023.17/63,043.98 = 12,443.31/x
3. Step 3: Cross multiply
   42,023.17x = 63,043.98 × 12,443.31
4. Step 4: Simplify right side
   42,023.17x = 784,475,786.77
5. Step 5: Solve for x
   x = 784,475,786.77/42,023.17
6. Step 6: Final answer
   x = 18,667.70