Finding the Fourth Proportional to 42,979.21, 64,471.83 and 17,994.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,979.21 : 64,471.83 = 17,994.04 : x
2. Step 2: Convert to fraction form
   42,979.21/64,471.83 = 17,994.04/x
3. Step 3: Cross multiply
   42,979.21x = 64,471.83 × 17,994.04
4. Step 4: Simplify right side
   42,979.21x = 1,160,108,687.89
5. Step 5: Solve for x
   x = 1,160,108,687.89/42,979.21
6. Step 6: Final answer
   x = 26,992.32