Finding the Fourth Proportional to 31,109.60, 42,912.16 and 19,912.16

Step by Step Solution

1. Step 1: Write the proportion equation
   31,109.60 : 42,912.16 = 19,912.16 : x
2. Step 2: Convert to fraction form
   31,109.60/42,912.16 = 19,912.16/x
3. Step 3: Cross multiply
   31,109.60x = 42,912.16 × 19,912.16
4. Step 4: Simplify right side
   31,109.60x = 854,473,795.87
5. Step 5: Solve for x
   x = 854,473,795.87/31,109.60
6. Step 6: Final answer
   x = 27,466.56