Finding the Fourth Proportional to 37,208.77, 55,812.72 and 9,128.55

Step by Step Solution

1. Step 1: Write the proportion equation
   37,208.77 : 55,812.72 = 9,128.55 : x
2. Step 2: Convert to fraction form
   37,208.77/55,812.72 = 9,128.55/x
3. Step 3: Cross multiply
   37,208.77x = 55,812.72 × 9,128.55
4. Step 4: Simplify right side
   37,208.77x = 509,489,109.07
5. Step 5: Solve for x
   x = 509,489,109.07/37,208.77
6. Step 6: Final answer
   x = 13,692.72