Finding the Fourth Proportional to 42,672.64, 64,007.04 and 16,389.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,672.64 : 64,007.04 = 16,389.76 : x
2. Step 2: Convert to fraction form
   42,672.64/64,007.04 = 16,389.76/x
3. Step 3: Cross multiply
   42,672.64x = 64,007.04 × 16,389.76
4. Step 4: Simplify right side
   42,672.64x = 1,049,060,023.91
5. Step 5: Solve for x
   x = 1,049,060,023.91/42,672.64
6. Step 6: Final answer
   x = 24,583.90