Finding the Fourth Proportional to 37,904.40, 52,308.06 and 21,990

Step by Step Solution

1. Step 1: Write the proportion equation
   37,904.40 : 52,308.06 = 21,990 : x
2. Step 2: Convert to fraction form
   37,904.40/52,308.06 = 21,990/x
3. Step 3: Cross multiply
   37,904.40x = 52,308.06 × 21,990
4. Step 4: Simplify right side
   37,904.40x = 1,150,254,239.40
5. Step 5: Solve for x
   x = 1,150,254,239.40/37,904.40
6. Step 6: Final answer
   x = 30,346.19