Finding the Fourth Proportional to 42,318.54, 63,479.12 and 12,736.59

Step by Step Solution

1. Step 1: Write the proportion equation
   42,318.54 : 63,479.12 = 12,736.59 : x
2. Step 2: Convert to fraction form
   42,318.54/63,479.12 = 12,736.59/x
3. Step 3: Cross multiply
   42,318.54x = 63,479.12 × 12,736.59
4. Step 4: Simplify right side
   42,318.54x = 808,507,461.32
5. Step 5: Solve for x
   x = 808,507,461.32/42,318.54
6. Step 6: Final answer
   x = 19,105.28