Finding the Fourth Proportional to 105,090.72, 157,632.24 and 31,216.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,090.72 : 157,632.24 = 31,216.80 : x
2. Step 2: Convert to fraction form
   105,090.72/157,632.24 = 31,216.80/x
3. Step 3: Cross multiply
   105,090.72x = 157,632.24 × 31,216.80
4. Step 4: Simplify right side
   105,090.72x = 4,920,774,109.63
5. Step 5: Solve for x
   x = 4,920,774,109.63/105,090.72
6. Step 6: Final answer
   x = 46,824.06