Finding the Fourth Proportional to 42,021, 63,032.72 and 10,856.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42,021 : 63,032.72 = 10,856.25 : x
2. Step 2: Convert to fraction form
   42,021/63,032.72 = 10,856.25/x
3. Step 3: Cross multiply
   42,021x = 63,032.72 × 10,856.25
4. Step 4: Simplify right side
   42,021x = 684,298,912.22
5. Step 5: Solve for x
   x = 684,298,912.22/42,021
6. Step 6: Final answer
   x = 16,284.69