Finding the Fourth Proportional to 42,975.29, 64,466.04 and 17,990.17

Step by Step Solution

1. Step 1: Write the proportion equation
   42,975.29 : 64,466.04 = 17,990.17 : x
2. Step 2: Convert to fraction form
   42,975.29/64,466.04 = 17,990.17/x
3. Step 3: Cross multiply
   42,975.29x = 64,466.04 × 17,990.17
4. Step 4: Simplify right side
   42,975.29x = 1,159,755,018.83
5. Step 5: Solve for x
   x = 1,159,755,018.83/42,975.29
6. Step 6: Final answer
   x = 26,986.55