Finding the Fourth Proportional to 123,005.40, 169,668.72 and 77,603.28

Step by Step Solution

1. Step 1: Write the proportion equation
   123,005.40 : 169,668.72 = 77,603.28 : x
2. Step 2: Convert to fraction form
   123,005.40/169,668.72 = 77,603.28/x
3. Step 3: Cross multiply
   123,005.40x = 169,668.72 × 77,603.28
4. Step 4: Simplify right side
   123,005.40x = 13,166,849,185.40
5. Step 5: Solve for x
   x = 13,166,849,185.40/123,005.40
6. Step 6: Final answer
   x = 107,042.85