Finding the Fourth Proportional to 72,131.89, 99,540.16 and 40,300.99

Step by Step Solution

1. Step 1: Write the proportion equation
   72,131.89 : 99,540.16 = 40,300.99 : x
2. Step 2: Convert to fraction form
   72,131.89/99,540.16 = 40,300.99/x
3. Step 3: Cross multiply
   72,131.89x = 99,540.16 × 40,300.99
4. Step 4: Simplify right side
   72,131.89x = 4,011,566,992.76
5. Step 5: Solve for x
   x = 4,011,566,992.76/72,131.89
6. Step 6: Final answer
   x = 55,614.33