Finding the Fourth Proportional to 42,121.28, 63,181.89 and 10,956.53

Step by Step Solution

1. Step 1: Write the proportion equation
   42,121.28 : 63,181.89 = 10,956.53 : x
2. Step 2: Convert to fraction form
   42,121.28/63,181.89 = 10,956.53/x
3. Step 3: Cross multiply
   42,121.28x = 63,181.89 × 10,956.53
4. Step 4: Simplify right side
   42,121.28x = 692,254,431.20
5. Step 5: Solve for x
   x = 692,254,431.20/42,121.28
6. Step 6: Final answer
   x = 16,434.79