Finding the Fourth Proportional to 42,949.72, 64,423.79 and 17,643.86

Step by Step Solution

1. Step 1: Write the proportion equation
   42,949.72 : 64,423.79 = 17,643.86 : x
2. Step 2: Convert to fraction form
   42,949.72/64,423.79 = 17,643.86/x
3. Step 3: Cross multiply
   42,949.72x = 64,423.79 × 17,643.86
4. Step 4: Simplify right side
   42,949.72x = 1,136,684,331.43
5. Step 5: Solve for x
   x = 1,136,684,331.43/42,949.72
6. Step 6: Final answer
   x = 26,465.47