Finding the Fourth Proportional to 28,667.32, 39,557.42 and 16,089.40

Step by Step Solution

1. Step 1: Write the proportion equation
   28,667.32 : 39,557.42 = 16,089.40 : x
2. Step 2: Convert to fraction form
   28,667.32/39,557.42 = 16,089.40/x
3. Step 3: Cross multiply
   28,667.32x = 39,557.42 × 16,089.40
4. Step 4: Simplify right side
   28,667.32x = 636,455,153.35
5. Step 5: Solve for x
   x = 636,455,153.35/28,667.32
6. Step 6: Final answer
   x = 22,201.42