Finding the Fourth Proportional to 42,686.73, 64,030.25 and 13,104.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,686.73 : 64,030.25 = 13,104.56 : x
2. Step 2: Convert to fraction form
   42,686.73/64,030.25 = 13,104.56/x
3. Step 3: Cross multiply
   42,686.73x = 64,030.25 × 13,104.56
4. Step 4: Simplify right side
   42,686.73x = 839,088,347.49
5. Step 5: Solve for x
   x = 839,088,347.49/42,686.73
6. Step 6: Final answer
   x = 19,656.89