Finding the Fourth Proportional to 30,087.42, 45,129.31 and 7,900.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,087.42 : 45,129.31 = 7,900.31 : x
2. Step 2: Convert to fraction form
   30,087.42/45,129.31 = 7,900.31/x
3. Step 3: Cross multiply
   30,087.42x = 45,129.31 × 7,900.31
4. Step 4: Simplify right side
   30,087.42x = 356,535,293.69
5. Step 5: Solve for x
   x = 356,535,293.69/30,087.42
6. Step 6: Final answer
   x = 11,849.98