Finding the Fourth Proportional to 105,012.80, 157,464.80 and 31,131.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,012.80 : 157,464.80 = 31,131.20 : x
2. Step 2: Convert to fraction form
   105,012.80/157,464.80 = 31,131.20/x
3. Step 3: Cross multiply
   105,012.80x = 157,464.80 × 31,131.20
4. Step 4: Simplify right side
   105,012.80x = 4,902,068,181.76
5. Step 5: Solve for x
   x = 4,902,068,181.76/105,012.80
6. Step 6: Final answer
   x = 46,680.67