Finding the Fourth Proportional to 123,615.42, 170,283.91 and 105,406.84

Step by Step Solution

1. Step 1: Write the proportion equation
   123,615.42 : 170,283.91 = 105,406.84 : x
2. Step 2: Convert to fraction form
   123,615.42/170,283.91 = 105,406.84/x
3. Step 3: Cross multiply
   123,615.42x = 170,283.91 × 105,406.84
4. Step 4: Simplify right side
   123,615.42x = 17,949,088,855.94
5. Step 5: Solve for x
   x = 17,949,088,855.94/123,615.42
6. Step 6: Final answer
   x = 145,201.05