Finding the Fourth Proportional to 38,395.38, 52,978.61 and 21,399.20

Step by Step Solution

1. Step 1: Write the proportion equation
   38,395.38 : 52,978.61 = 21,399.20 : x
2. Step 2: Convert to fraction form
   38,395.38/52,978.61 = 21,399.20/x
3. Step 3: Cross multiply
   38,395.38x = 52,978.61 × 21,399.20
4. Step 4: Simplify right side
   38,395.38x = 1,133,699,499.22
5. Step 5: Solve for x
   x = 1,133,699,499.22/38,395.38
6. Step 6: Final answer
   x = 29,526.98