Finding the Fourth Proportional to 105,380.46, 145,424.72 and 56,982.06

Step by Step Solution

1. Step 1: Write the proportion equation
   105,380.46 : 145,424.72 = 56,982.06 : x
2. Step 2: Convert to fraction form
   105,380.46/145,424.72 = 56,982.06/x
3. Step 3: Cross multiply
   105,380.46x = 145,424.72 × 56,982.06
4. Step 4: Simplify right side
   105,380.46x = 8,286,599,835.61
5. Step 5: Solve for x
   x = 8,286,599,835.61/105,380.46
6. Step 6: Final answer
   x = 78,635.07