Finding the Fourth Proportional to 72,143.22, 99,555.72 and 40,312.38

Step by Step Solution

1. Step 1: Write the proportion equation
   72,143.22 : 99,555.72 = 40,312.38 : x
2. Step 2: Convert to fraction form
   72,143.22/99,555.72 = 40,312.38/x
3. Step 3: Cross multiply
   72,143.22x = 99,555.72 × 40,312.38
4. Step 4: Simplify right side
   72,143.22x = 4,013,328,015.81
5. Step 5: Solve for x
   x = 4,013,328,015.81/72,143.22
6. Step 6: Final answer
   x = 55,630.01