Finding the Fourth Proportional to 143,380.72, 215,066.22 and 54,631.05

Step by Step Solution

1. Step 1: Write the proportion equation
   143,380.72 : 215,066.22 = 54,631.05 : x
2. Step 2: Convert to fraction form
   143,380.72/215,066.22 = 54,631.05/x
3. Step 3: Cross multiply
   143,380.72x = 215,066.22 × 54,631.05
4. Step 4: Simplify right side
   143,380.72x = 11,749,293,418.13
5. Step 5: Solve for x
   x = 11,749,293,418.13/143,380.72
6. Step 6: Final answer
   x = 81,944.72