Finding the Fourth Proportional to 105,983.76, 146,215.68 and 68,280

Step by Step Solution

1. Step 1: Write the proportion equation
   105,983.76 : 146,215.68 = 68,280 : x
2. Step 2: Convert to fraction form
   105,983.76/146,215.68 = 68,280/x
3. Step 3: Cross multiply
   105,983.76x = 146,215.68 × 68,280
4. Step 4: Simplify right side
   105,983.76x = 9,983,606,630.40
5. Step 5: Solve for x
   x = 9,983,606,630.40/105,983.76
6. Step 6: Final answer
   x = 94,199.40