Finding the Fourth Proportional to 42,665.64, 64,008.56 and 19,292.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,665.64 : 64,008.56 = 19,292.04 : x
2. Step 2: Convert to fraction form
   42,665.64/64,008.56 = 19,292.04/x
3. Step 3: Cross multiply
   42,665.64x = 64,008.56 × 19,292.04
4. Step 4: Simplify right side
   42,665.64x = 1,234,855,699.86
5. Step 5: Solve for x
   x = 1,234,855,699.86/42,665.64
6. Step 6: Final answer
   x = 28,942.63