Finding the Fourth Proportional to 42,945.88, 64,409.10 and 19,579

Step by Step Solution

1. Step 1: Write the proportion equation
   42,945.88 : 64,409.10 = 19,579 : x
2. Step 2: Convert to fraction form
   42,945.88/64,409.10 = 19,579/x
3. Step 3: Cross multiply
   42,945.88x = 64,409.10 × 19,579
4. Step 4: Simplify right side
   42,945.88x = 1,261,065,768.90
5. Step 5: Solve for x
   x = 1,261,065,768.90/42,945.88
6. Step 6: Final answer
   x = 29,364.07