Finding the Fourth Proportional to 42,321.96, 63,491.31 and 12,738.33

Step by Step Solution

1. Step 1: Write the proportion equation
   42,321.96 : 63,491.31 = 12,738.33 : x
2. Step 2: Convert to fraction form
   42,321.96/63,491.31 = 12,738.33/x
3. Step 3: Cross multiply
   42,321.96x = 63,491.31 × 12,738.33
4. Step 4: Simplify right side
   42,321.96x = 808,773,258.91
5. Step 5: Solve for x
   x = 808,773,258.91/42,321.96
6. Step 6: Final answer
   x = 19,110.01