Finding the Fourth Proportional to 72,311.10, 99,704.34 and 57,959.46

Step by Step Solution

1. Step 1: Write the proportion equation
   72,311.10 : 99,704.34 = 57,959.46 : x
2. Step 2: Convert to fraction form
   72,311.10/99,704.34 = 57,959.46/x
3. Step 3: Cross multiply
   72,311.10x = 99,704.34 × 57,959.46
4. Step 4: Simplify right side
   72,311.10x = 5,778,809,706.06
5. Step 5: Solve for x
   x = 5,778,809,706.06/72,311.10
6. Step 6: Final answer
   x = 79,915.94