Finding the Fourth Proportional to 105,800.32, 145,724.16 and 78,856.48

Step by Step Solution

1. Step 1: Write the proportion equation
   105,800.32 : 145,724.16 = 78,856.48 : x
2. Step 2: Convert to fraction form
   105,800.32/145,724.16 = 78,856.48/x
3. Step 3: Cross multiply
   105,800.32x = 145,724.16 × 78,856.48
4. Step 4: Simplify right side
   105,800.32x = 11,491,294,308.56
5. Step 5: Solve for x
   x = 11,491,294,308.56/105,800.32
6. Step 6: Final answer
   x = 108,613.04