Finding the Fourth Proportional to 31,152, 42,989.80 and 19,974

Step by Step Solution

1. Step 1: Write the proportion equation
   31,152 : 42,989.80 = 19,974 : x
2. Step 2: Convert to fraction form
   31,152/42,989.80 = 19,974/x
3. Step 3: Cross multiply
   31,152x = 42,989.80 × 19,974
4. Step 4: Simplify right side
   31,152x = 858,678,265.20
5. Step 5: Solve for x
   x = 858,678,265.20/31,152
6. Step 6: Final answer
   x = 27,564.15