Finding the Fourth Proportional to 100,915.20, 151,367.31 and 30,789

Step by Step Solution

1. Step 1: Write the proportion equation
   100,915.20 : 151,367.31 = 30,789 : x
2. Step 2: Convert to fraction form
   100,915.20/151,367.31 = 30,789/x
3. Step 3: Cross multiply
   100,915.20x = 151,367.31 × 30,789
4. Step 4: Simplify right side
   100,915.20x = 4,660,448,107.59
5. Step 5: Solve for x
   x = 4,660,448,107.59/100,915.20
6. Step 6: Final answer
   x = 46,181.83