Finding the Fourth Proportional to 42,755.78, 64,145.56 and 17,807.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,755.78 : 64,145.56 = 17,807.60 : x
2. Step 2: Convert to fraction form
   42,755.78/64,145.56 = 17,807.60/x
3. Step 3: Cross multiply
   42,755.78x = 64,145.56 × 17,807.60
4. Step 4: Simplify right side
   42,755.78x = 1,142,278,474.26
5. Step 5: Solve for x
   x = 1,142,278,474.26/42,755.78
6. Step 6: Final answer
   x = 26,716.35