Finding the Fourth Proportional to 37,785, 52,143.30 and 21,018

Step by Step Solution

1. Step 1: Write the proportion equation
   37,785 : 52,143.30 = 21,018 : x
2. Step 2: Convert to fraction form
   37,785/52,143.30 = 21,018/x
3. Step 3: Cross multiply
   37,785x = 52,143.30 × 21,018
4. Step 4: Simplify right side
   37,785x = 1,095,947,879.40
5. Step 5: Solve for x
   x = 1,095,947,879.40/37,785
6. Step 6: Final answer
   x = 29,004.84