Finding the Fourth Proportional to 123,406.93, 170,174.28 and 105,561.01

Step by Step Solution

1. Step 1: Write the proportion equation
   123,406.93 : 170,174.28 = 105,561.01 : x
2. Step 2: Convert to fraction form
   123,406.93/170,174.28 = 105,561.01/x
3. Step 3: Cross multiply
   123,406.93x = 170,174.28 × 105,561.01
4. Step 4: Simplify right side
   123,406.93x = 17,963,768,872.82
5. Step 5: Solve for x
   x = 17,963,768,872.82/123,406.93
6. Step 6: Final answer
   x = 145,565.32