Finding the Fourth Proportional to 42,759.34, 64,145.89 and 13,177.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,759.34 : 64,145.89 = 13,177.16 : x
2. Step 2: Convert to fraction form
   42,759.34/64,145.89 = 13,177.16/x
3. Step 3: Cross multiply
   42,759.34x = 64,145.89 × 13,177.16
4. Step 4: Simplify right side
   42,759.34x = 845,260,592.16
5. Step 5: Solve for x
   x = 845,260,592.16/42,759.34
6. Step 6: Final answer
   x = 19,767.86