Finding the Fourth Proportional to 31,153.35, 42,991.32 and 19,211.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,153.35 : 42,991.32 = 19,211.91 : x
2. Step 2: Convert to fraction form
   31,153.35/42,991.32 = 19,211.91/x
3. Step 3: Cross multiply
   31,153.35x = 42,991.32 × 19,211.91
4. Step 4: Simplify right side
   31,153.35x = 825,945,370.62
5. Step 5: Solve for x
   x = 825,945,370.62/31,153.35
6. Step 6: Final answer
   x = 26,512.25