Finding the Fourth Proportional to 36,978.64, 55,476.71 and 12,018.69

Step by Step Solution

1. Step 1: Write the proportion equation
   36,978.64 : 55,476.71 = 12,018.69 : x
2. Step 2: Convert to fraction form
   36,978.64/55,476.71 = 12,018.69/x
3. Step 3: Cross multiply
   36,978.64x = 55,476.71 × 12,018.69
4. Step 4: Simplify right side
   36,978.64x = 666,757,409.76
5. Step 5: Solve for x
   x = 666,757,409.76/36,978.64
6. Step 6: Final answer
   x = 18,030.88