Finding the Fourth Proportional to 42,944.78, 64,373.20 and 17,999.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,944.78 : 64,373.20 = 17,999.28 : x
2. Step 2: Convert to fraction form
   42,944.78/64,373.20 = 17,999.28/x
3. Step 3: Cross multiply
   42,944.78x = 64,373.20 × 17,999.28
4. Step 4: Simplify right side
   42,944.78x = 1,158,671,206.30
5. Step 5: Solve for x
   x = 1,158,671,206.30/42,944.78
6. Step 6: Final answer
   x = 26,980.49