Finding the Fourth Proportional to 31,146, 42,981.52 and 19,968

Step by Step Solution

1. Step 1: Write the proportion equation
   31,146 : 42,981.52 = 19,968 : x
2. Step 2: Convert to fraction form
   31,146/42,981.52 = 19,968/x
3. Step 3: Cross multiply
   31,146x = 42,981.52 × 19,968
4. Step 4: Simplify right side
   31,146x = 858,254,991.36
5. Step 5: Solve for x
   x = 858,254,991.36/31,146
6. Step 6: Final answer
   x = 27,555.87