Finding the Fourth Proportional to 39,777.16, 59,677.58 and 16,405

Step by Step Solution

1. Step 1: Write the proportion equation
   39,777.16 : 59,677.58 = 16,405 : x
2. Step 2: Convert to fraction form
   39,777.16/59,677.58 = 16,405/x
3. Step 3: Cross multiply
   39,777.16x = 59,677.58 × 16,405
4. Step 4: Simplify right side
   39,777.16x = 979,010,699.90
5. Step 5: Solve for x
   x = 979,010,699.90/39,777.16
6. Step 6: Final answer
   x = 24,612.38