Finding the Fourth Proportional to 42,760.88, 64,147.36 and 13,181.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,760.88 : 64,147.36 = 13,181.12 : x
2. Step 2: Convert to fraction form
   42,760.88/64,147.36 = 13,181.12/x
3. Step 3: Cross multiply
   42,760.88x = 64,147.36 × 13,181.12
4. Step 4: Simplify right side
   42,760.88x = 845,534,049.84
5. Step 5: Solve for x
   x = 845,534,049.84/42,760.88
6. Step 6: Final answer
   x = 19,773.54