Finding the Fourth Proportional to 115,048.72, 172,559.31 and 30,815.20

Step by Step Solution

1. Step 1: Write the proportion equation
   115,048.72 : 172,559.31 = 30,815.20 : x
2. Step 2: Convert to fraction form
   115,048.72/172,559.31 = 30,815.20/x
3. Step 3: Cross multiply
   115,048.72x = 172,559.31 × 30,815.20
4. Step 4: Simplify right side
   115,048.72x = 5,317,449,649.51
5. Step 5: Solve for x
   x = 5,317,449,649.51/115,048.72
6. Step 6: Final answer
   x = 46,219.11