Finding the Fourth Proportional to 72,142.30, 99,556.87 and 40,312.54

Step by Step Solution

1. Step 1: Write the proportion equation
   72,142.30 : 99,556.87 = 40,312.54 : x
2. Step 2: Convert to fraction form
   72,142.30/99,556.87 = 40,312.54/x
3. Step 3: Cross multiply
   72,142.30x = 99,556.87 × 40,312.54
4. Step 4: Simplify right side
   72,142.30x = 4,013,390,304.15
5. Step 5: Solve for x
   x = 4,013,390,304.15/72,142.30
6. Step 6: Final answer
   x = 55,631.58