Finding the Fourth Proportional to 123,405.93, 170,172.90 and 105,560.01

Step by Step Solution

1. Step 1: Write the proportion equation
   123,405.93 : 170,172.90 = 105,560.01 : x
2. Step 2: Convert to fraction form
   123,405.93/170,172.90 = 105,560.01/x
3. Step 3: Cross multiply
   123,405.93x = 170,172.90 × 105,560.01
4. Step 4: Simplify right side
   123,405.93x = 17,963,453,025.73
5. Step 5: Solve for x
   x = 17,963,453,025.73/123,405.93
6. Step 6: Final answer
   x = 145,563.94