Finding the Fourth Proportional to 37,999.90, 52,436.58 and 21,004.21

Step by Step Solution

1. Step 1: Write the proportion equation
   37,999.90 : 52,436.58 = 21,004.21 : x
2. Step 2: Convert to fraction form
   37,999.90/52,436.58 = 21,004.21/x
3. Step 3: Cross multiply
   37,999.90x = 52,436.58 × 21,004.21
4. Step 4: Simplify right side
   37,999.90x = 1,101,388,675.82
5. Step 5: Solve for x
   x = 1,101,388,675.82/37,999.90
6. Step 6: Final answer
   x = 28,983.99