Finding the Fourth Proportional to 42,976.29, 64,467.54 and 17,991.17

Step by Step Solution

1. Step 1: Write the proportion equation
   42,976.29 : 64,467.54 = 17,991.17 : x
2. Step 2: Convert to fraction form
   42,976.29/64,467.54 = 17,991.17/x
3. Step 3: Cross multiply
   42,976.29x = 64,467.54 × 17,991.17
4. Step 4: Simplify right side
   42,976.29x = 1,159,846,471.62
5. Step 5: Solve for x
   x = 1,159,846,471.62/42,976.29
6. Step 6: Final answer
   x = 26,988.05