Finding the Fourth Proportional to 42,634.53, 63,940.89 and 12,641.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,634.53 : 63,940.89 = 12,641.76 : x
2. Step 2: Convert to fraction form
   42,634.53/63,940.89 = 12,641.76/x
3. Step 3: Cross multiply
   42,634.53x = 63,940.89 × 12,641.76
4. Step 4: Simplify right side
   42,634.53x = 808,325,417.17
5. Step 5: Solve for x
   x = 808,325,417.17/42,634.53
6. Step 6: Final answer
   x = 18,959.41