Finding the Fourth Proportional to 42,429.61, 63,646.54 and 10,839.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,429.61 : 63,646.54 = 10,839.91 : x
2. Step 2: Convert to fraction form
   42,429.61/63,646.54 = 10,839.91/x
3. Step 3: Cross multiply
   42,429.61x = 63,646.54 × 10,839.91
4. Step 4: Simplify right side
   42,429.61x = 689,922,765.41
5. Step 5: Solve for x
   x = 689,922,765.41/42,429.61
6. Step 6: Final answer
   x = 16,260.41