Finding the Fourth Proportional to 31,102.58, 42,928.48 and 19,769.86

Step by Step Solution

1. Step 1: Write the proportion equation
   31,102.58 : 42,928.48 = 19,769.86 : x
2. Step 2: Convert to fraction form
   31,102.58/42,928.48 = 19,769.86/x
3. Step 3: Cross multiply
   31,102.58x = 42,928.48 × 19,769.86
4. Step 4: Simplify right side
   31,102.58x = 848,690,039.61
5. Step 5: Solve for x
   x = 848,690,039.61/31,102.58
6. Step 6: Final answer
   x = 27,286.81