Finding the Fourth Proportional to 42,976.04, 64,467.16 and 17,990.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,976.04 : 64,467.16 = 17,990.96 : x
2. Step 2: Convert to fraction form
   42,976.04/64,467.16 = 17,990.96/x
3. Step 3: Cross multiply
   42,976.04x = 64,467.16 × 17,990.96
4. Step 4: Simplify right side
   42,976.04x = 1,159,826,096.87
5. Step 5: Solve for x
   x = 1,159,826,096.87/42,976.04
6. Step 6: Final answer
   x = 26,987.74