Finding the Fourth Proportional to 258,462.72, 387,693.60 and 80,983.32

Step by Step Solution

1. Step 1: Write the proportion equation
   258,462.72 : 387,693.60 = 80,983.32 : x
2. Step 2: Convert to fraction form
   258,462.72/387,693.60 = 80,983.32/x
3. Step 3: Cross multiply
   258,462.72x = 387,693.60 × 80,983.32
4. Step 4: Simplify right side
   258,462.72x = 31,396,714,870.75
5. Step 5: Solve for x
   x = 31,396,714,870.75/258,462.72
6. Step 6: Final answer
   x = 121,474.83