Finding the Fourth Proportional to 42,978.74, 64,466.67 and 17,677.38

Step by Step Solution

1. Step 1: Write the proportion equation
   42,978.74 : 64,466.67 = 17,677.38 : x
2. Step 2: Convert to fraction form
   42,978.74/64,466.67 = 17,677.38/x
3. Step 3: Cross multiply
   42,978.74x = 64,466.67 × 17,677.38
4. Step 4: Simplify right side
   42,978.74x = 1,139,601,822.92
5. Step 5: Solve for x
   x = 1,139,601,822.92/42,978.74
6. Step 6: Final answer
   x = 26,515.48