Finding the Fourth Proportional to 72,401.36, 99,381.11 and 64,265.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,401.36 : 99,381.11 = 64,265.72 : x
2. Step 2: Convert to fraction form
   72,401.36/99,381.11 = 64,265.72/x
3. Step 3: Cross multiply
   72,401.36x = 99,381.11 × 64,265.72
4. Step 4: Simplify right side
   72,401.36x = 6,386,797,770.32
5. Step 5: Solve for x
   x = 6,386,797,770.32/72,401.36
6. Step 6: Final answer
   x = 88,213.79