Finding the Fourth Proportional to 42,428.61, 63,645.04 and 10,838.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,428.61 : 63,645.04 = 10,838.91 : x
2. Step 2: Convert to fraction form
   42,428.61/63,645.04 = 10,838.91/x
3. Step 3: Cross multiply
   42,428.61x = 63,645.04 × 10,838.91
4. Step 4: Simplify right side
   42,428.61x = 689,843,112.72
5. Step 5: Solve for x
   x = 689,843,112.72/42,428.61
6. Step 6: Final answer
   x = 16,258.91