Finding the Fourth Proportional to 31,112.87, 42,939.93 and 19,783.49

Step by Step Solution

1. Step 1: Write the proportion equation
   31,112.87 : 42,939.93 = 19,783.49 : x
2. Step 2: Convert to fraction form
   31,112.87/42,939.93 = 19,783.49/x
3. Step 3: Cross multiply
   31,112.87x = 42,939.93 × 19,783.49
4. Step 4: Simplify right side
   31,112.87x = 849,501,461.06
5. Step 5: Solve for x
   x = 849,501,461.06/31,112.87
6. Step 6: Final answer
   x = 27,303.86