Finding the Fourth Proportional to 52,266.72, 72,078.88 and 40,311.12

Step by Step Solution

1. Step 1: Write the proportion equation
   52,266.72 : 72,078.88 = 40,311.12 : x
2. Step 2: Convert to fraction form
   52,266.72/72,078.88 = 40,311.12/x
3. Step 3: Cross multiply
   52,266.72x = 72,078.88 × 40,311.12
4. Step 4: Simplify right side
   52,266.72x = 2,905,580,381.15
5. Step 5: Solve for x
   x = 2,905,580,381.15/52,266.72
6. Step 6: Final answer
   x = 55,591.40