Finding the Fourth Proportional to 72,380.78, 99,885.39 and 40,549.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72,380.78 : 99,885.39 = 40,549.91 : x
2. Step 2: Convert to fraction form
   72,380.78/99,885.39 = 40,549.91/x
3. Step 3: Cross multiply
   72,380.78x = 99,885.39 × 40,549.91
4. Step 4: Simplify right side
   72,380.78x = 4,050,343,075.39
5. Step 5: Solve for x
   x = 4,050,343,075.39/72,380.78
6. Step 6: Final answer
   x = 55,958.82