Finding the Fourth Proportional to 105,609.42, 145,870.47 and 85,489.02

Step by Step Solution

1. Step 1: Write the proportion equation
   105,609.42 : 145,870.47 = 85,489.02 : x
2. Step 2: Convert to fraction form
   105,609.42/145,870.47 = 85,489.02/x
3. Step 3: Cross multiply
   105,609.42x = 145,870.47 × 85,489.02
4. Step 4: Simplify right side
   105,609.42x = 12,470,323,527.24
5. Step 5: Solve for x
   x = 12,470,323,527.24/105,609.42
6. Step 6: Final answer
   x = 118,079.65