Finding the Fourth Proportional to 72,385.79, 108,429.23 and 53,686.94

Step by Step Solution

1. Step 1: Write the proportion equation
   72,385.79 : 108,429.23 = 53,686.94 : x
2. Step 2: Convert to fraction form
   72,385.79/108,429.23 = 53,686.94/x
3. Step 3: Cross multiply
   72,385.79x = 108,429.23 × 53,686.94
4. Step 4: Simplify right side
   72,385.79x = 5,821,233,157.33
5. Step 5: Solve for x
   x = 5,821,233,157.33/72,385.79
6. Step 6: Final answer
   x = 80,419.56