Finding the Fourth Proportional to 161,979, 243,007.47 and 51,171

Step by Step Solution

1. Step 1: Write the proportion equation
   161,979 : 243,007.47 = 51,171 : x
2. Step 2: Convert to fraction form
   161,979/243,007.47 = 51,171/x
3. Step 3: Cross multiply
   161,979x = 243,007.47 × 51,171
4. Step 4: Simplify right side
   161,979x = 12,434,935,247.37
5. Step 5: Solve for x
   x = 12,434,935,247.37/161,979
6. Step 6: Final answer
   x = 76,768.81