Finding the Fourth Proportional to 72,020.80, 107,864.16 and 69,528.96

Step by Step Solution

1. Step 1: Write the proportion equation
   72,020.80 : 107,864.16 = 69,528.96 : x
2. Step 2: Convert to fraction form
   72,020.80/107,864.16 = 69,528.96/x
3. Step 3: Cross multiply
   72,020.80x = 107,864.16 × 69,528.96
4. Step 4: Simplify right side
   72,020.80x = 7,499,682,866.07
5. Step 5: Solve for x
   x = 7,499,682,866.07/72,020.80
6. Step 6: Final answer
   x = 104,132.18