Finding the Fourth Proportional to 30,739.29, 42,143.72 and 30,178.87

Step by Step Solution

1. Step 1: Write the proportion equation
   30,739.29 : 42,143.72 = 30,178.87 : x
2. Step 2: Convert to fraction form
   30,739.29/42,143.72 = 30,178.87/x
3. Step 3: Cross multiply
   30,739.29x = 42,143.72 × 30,178.87
4. Step 4: Simplify right side
   30,739.29x = 1,271,849,847.20
5. Step 5: Solve for x
   x = 1,271,849,847.20/30,739.29
6. Step 6: Final answer
   x = 41,375.38