Finding the Fourth Proportional to 72,145.75, 99,559.21 and 40,314.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72,145.75 : 99,559.21 = 40,314.91 : x
2. Step 2: Convert to fraction form
   72,145.75/99,559.21 = 40,314.91/x
3. Step 3: Cross multiply
   72,145.75x = 99,559.21 × 40,314.91
4. Step 4: Simplify right side
   72,145.75x = 4,013,720,093.03
5. Step 5: Solve for x
   x = 4,013,720,093.03/72,145.75
6. Step 6: Final answer
   x = 55,633.50