Finding the Fourth Proportional to 72,143.71, 99,556.41 and 40,312.87

Step by Step Solution

1. Step 1: Write the proportion equation
   72,143.71 : 99,556.41 = 40,312.87 : x
2. Step 2: Convert to fraction form
   72,143.71/99,556.41 = 40,312.87/x
3. Step 3: Cross multiply
   72,143.71x = 99,556.41 × 40,312.87
4. Step 4: Simplify right side
   72,143.71x = 4,013,404,614.00
5. Step 5: Solve for x
   x = 4,013,404,614.00/72,143.71
6. Step 6: Final answer
   x = 55,630.69