Finding the Fourth Proportional to 42,974.29, 64,464.54 and 17,989.17

Step by Step Solution

1. Step 1: Write the proportion equation
   42,974.29 : 64,464.54 = 17,989.17 : x
2. Step 2: Convert to fraction form
   42,974.29/64,464.54 = 17,989.17/x
3. Step 3: Cross multiply
   42,974.29x = 64,464.54 × 17,989.17
4. Step 4: Simplify right side
   42,974.29x = 1,159,663,569.03
5. Step 5: Solve for x
   x = 1,159,663,569.03/42,974.29
6. Step 6: Final answer
   x = 26,985.05