Finding the Fourth Proportional to 38,398.72, 52,990.49 and 21,404.05

Step by Step Solution

1. Step 1: Write the proportion equation
   38,398.72 : 52,990.49 = 21,404.05 : x
2. Step 2: Convert to fraction form
   38,398.72/52,990.49 = 21,404.05/x
3. Step 3: Cross multiply
   38,398.72x = 52,990.49 × 21,404.05
4. Step 4: Simplify right side
   38,398.72x = 1,134,211,097.48
5. Step 5: Solve for x
   x = 1,134,211,097.48/38,398.72
6. Step 6: Final answer
   x = 29,537.73