Finding the Fourth Proportional to 42,711.46, 64,073.33 and 13,131.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,711.46 : 64,073.33 = 13,131.78 : x
2. Step 2: Convert to fraction form
   42,711.46/64,073.33 = 13,131.78/x
3. Step 3: Cross multiply
   42,711.46x = 64,073.33 × 13,131.78
4. Step 4: Simplify right side
   42,711.46x = 841,396,873.43
5. Step 5: Solve for x
   x = 841,396,873.43/42,711.46
6. Step 6: Final answer
   x = 19,699.56