Finding the Fourth Proportional to 31,144.64, 42,986.50 and 19,811.93

Step by Step Solution

1. Step 1: Write the proportion equation
   31,144.64 : 42,986.50 = 19,811.93 : x
2. Step 2: Convert to fraction form
   31,144.64/42,986.50 = 19,811.93/x
3. Step 3: Cross multiply
   31,144.64x = 42,986.50 × 19,811.93
4. Step 4: Simplify right side
   31,144.64x = 851,645,264.48
5. Step 5: Solve for x
   x = 851,645,264.48/31,144.64
6. Step 6: Final answer
   x = 27,344.85