Finding the Fourth Proportional to 31,128, 42,956.64 and 19,950

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128 : 42,956.64 = 19,950 : x
2. Step 2: Convert to fraction form
   31,128/42,956.64 = 19,950/x
3. Step 3: Cross multiply
   31,128x = 42,956.64 × 19,950
4. Step 4: Simplify right side
   31,128x = 856,984,968
5. Step 5: Solve for x
   x = 856,984,968/31,128
6. Step 6: Final answer
   x = 27,531