Finding the Fourth Proportional to 72,770.88, 109,162.80 and 31,208.16

Step by Step Solution

1. Step 1: Write the proportion equation
   72,770.88 : 109,162.80 = 31,208.16 : x
2. Step 2: Convert to fraction form
   72,770.88/109,162.80 = 31,208.16/x
3. Step 3: Cross multiply
   72,770.88x = 109,162.80 × 31,208.16
4. Step 4: Simplify right side
   72,770.88x = 3,406,770,128.45
5. Step 5: Solve for x
   x = 3,406,770,128.45/72,770.88
6. Step 6: Final answer
   x = 46,815.02