Finding the Fourth Proportional to 36,978.66, 55,485 and 13,621.50

Step by Step Solution

1. Step 1: Write the proportion equation
   36,978.66 : 55,485 = 13,621.50 : x
2. Step 2: Convert to fraction form
   36,978.66/55,485 = 13,621.50/x
3. Step 3: Cross multiply
   36,978.66x = 55,485 × 13,621.50
4. Step 4: Simplify right side
   36,978.66x = 755,788,927.50
5. Step 5: Solve for x
   x = 755,788,927.50/36,978.66
6. Step 6: Final answer
   x = 20,438.52