Finding the Fourth Proportional to 72,152.72, 99,567.06 and 40,315.40

Step by Step Solution

1. Step 1: Write the proportion equation
   72,152.72 : 99,567.06 = 40,315.40 : x
2. Step 2: Convert to fraction form
   72,152.72/99,567.06 = 40,315.40/x
3. Step 3: Cross multiply
   72,152.72x = 99,567.06 × 40,315.40
4. Step 4: Simplify right side
   72,152.72x = 4,014,085,850.72
5. Step 5: Solve for x
   x = 4,014,085,850.72/72,152.72
6. Step 6: Final answer
   x = 55,633.19