Finding the Fourth Proportional to 104,521.05, 144,159.59 and 72,309.28

Step by Step Solution

1. Step 1: Write the proportion equation
   104,521.05 : 144,159.59 = 72,309.28 : x
2. Step 2: Convert to fraction form
   104,521.05/144,159.59 = 72,309.28/x
3. Step 3: Cross multiply
   104,521.05x = 144,159.59 × 72,309.28
4. Step 4: Simplify right side
   104,521.05x = 10,424,075,436.05
5. Step 5: Solve for x
   x = 10,424,075,436.05/104,521.05
6. Step 6: Final answer
   x = 99,731.82