Finding the Fourth Proportional to 42,734.42, 64,108.92 and 13,151.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,734.42 : 64,108.92 = 13,151.60 : x
2. Step 2: Convert to fraction form
   42,734.42/64,108.92 = 13,151.60/x
3. Step 3: Cross multiply
   42,734.42x = 64,108.92 × 13,151.60
4. Step 4: Simplify right side
   42,734.42x = 843,134,551.73
5. Step 5: Solve for x
   x = 843,134,551.73/42,734.42
6. Step 6: Final answer
   x = 19,729.64