Finding the Fourth Proportional to 144,057.45, 216,056.31 and 42,856.05

Step by Step Solution

1. Step 1: Write the proportion equation
   144,057.45 : 216,056.31 = 42,856.05 : x
2. Step 2: Convert to fraction form
   144,057.45/216,056.31 = 42,856.05/x
3. Step 3: Cross multiply
   144,057.45x = 216,056.31 × 42,856.05
4. Step 4: Simplify right side
   144,057.45x = 9,259,320,024.18
5. Step 5: Solve for x
   x = 9,259,320,024.18/144,057.45
6. Step 6: Final answer
   x = 64,275.19