Finding the Fourth Proportional to 42,892.61, 64,338.96 and 17,919.05

Step by Step Solution

1. Step 1: Write the proportion equation
   42,892.61 : 64,338.96 = 17,919.05 : x
2. Step 2: Convert to fraction form
   42,892.61/64,338.96 = 17,919.05/x
3. Step 3: Cross multiply
   42,892.61x = 64,338.96 × 17,919.05
4. Step 4: Simplify right side
   42,892.61x = 1,152,892,866.85
5. Step 5: Solve for x
   x = 1,152,892,866.85/42,892.61
6. Step 6: Final answer
   x = 26,878.59