Finding the Fourth Proportional to 42,778.73, 64,177.25 and 12,795.32

Step by Step Solution

1. Step 1: Write the proportion equation
   42,778.73 : 64,177.25 = 12,795.32 : x
2. Step 2: Convert to fraction form
   42,778.73/64,177.25 = 12,795.32/x
3. Step 3: Cross multiply
   42,778.73x = 64,177.25 × 12,795.32
4. Step 4: Simplify right side
   42,778.73x = 821,168,065.61
5. Step 5: Solve for x
   x = 821,168,065.61/42,778.73
6. Step 6: Final answer
   x = 19,195.71