Finding the Fourth Proportional to 72,144.20, 99,558.62 and 40,312.82

Step by Step Solution

1. Step 1: Write the proportion equation
   72,144.20 : 99,558.62 = 40,312.82 : x
2. Step 2: Convert to fraction form
   72,144.20/99,558.62 = 40,312.82/x
3. Step 3: Cross multiply
   72,144.20x = 99,558.62 × 40,312.82
4. Step 4: Simplify right side
   72,144.20x = 4,013,488,926.01
5. Step 5: Solve for x
   x = 4,013,488,926.01/72,144.20
6. Step 6: Final answer
   x = 55,631.48