Finding the Fourth Proportional to 31,728.70, 43,696.83 and 31,039.93

Step by Step Solution

1. Step 1: Write the proportion equation
   31,728.70 : 43,696.83 = 31,039.93 : x
2. Step 2: Convert to fraction form
   31,728.70/43,696.83 = 31,039.93/x
3. Step 3: Cross multiply
   31,728.70x = 43,696.83 × 31,039.93
4. Step 4: Simplify right side
   31,728.70x = 1,356,346,544.42
5. Step 5: Solve for x
   x = 1,356,346,544.42/31,728.70
6. Step 6: Final answer
   x = 42,748.25