Finding the Fourth Proportional to 72,811.80, 109,008.18 and 65,213.88

Step by Step Solution

1. Step 1: Write the proportion equation
   72,811.80 : 109,008.18 = 65,213.88 : x
2. Step 2: Convert to fraction form
   72,811.80/109,008.18 = 65,213.88/x
3. Step 3: Cross multiply
   72,811.80x = 109,008.18 × 65,213.88
4. Step 4: Simplify right side
   72,811.80x = 7,108,846,369.54
5. Step 5: Solve for x
   x = 7,108,846,369.54/72,811.80
6. Step 6: Final answer
   x = 97,633.16