Finding the Fourth Proportional to 42,840.59, 64,274.01 and 19,168.05

Step by Step Solution

1. Step 1: Write the proportion equation
   42,840.59 : 64,274.01 = 19,168.05 : x
2. Step 2: Convert to fraction form
   42,840.59/64,274.01 = 19,168.05/x
3. Step 3: Cross multiply
   42,840.59x = 64,274.01 × 19,168.05
4. Step 4: Simplify right side
   42,840.59x = 1,232,007,437.38
5. Step 5: Solve for x
   x = 1,232,007,437.38/42,840.59
6. Step 6: Final answer
   x = 28,757.95