Finding the Fourth Proportional to 42,986.28, 64,472.12 and 19,607.24

Step by Step Solution

1. Step 1: Write the proportion equation
   42,986.28 : 64,472.12 = 19,607.24 : x
2. Step 2: Convert to fraction form
   42,986.28/64,472.12 = 19,607.24/x
3. Step 3: Cross multiply
   42,986.28x = 64,472.12 × 19,607.24
4. Step 4: Simplify right side
   42,986.28x = 1,264,120,330.15
5. Step 5: Solve for x
   x = 1,264,120,330.15/42,986.28
6. Step 6: Final answer
   x = 29,407.53