Finding the Fourth Proportional to 72,862.72, 109,272.48 and 31,300

Step by Step Solution

1. Step 1: Write the proportion equation
   72,862.72 : 109,272.48 = 31,300 : x
2. Step 2: Convert to fraction form
   72,862.72/109,272.48 = 31,300/x
3. Step 3: Cross multiply
   72,862.72x = 109,272.48 × 31,300
4. Step 4: Simplify right side
   72,862.72x = 3,420,228,624
5. Step 5: Solve for x
   x = 3,420,228,624/72,862.72
6. Step 6: Final answer
   x = 46,940.72