Finding the Fourth Proportional to 38,399.83, 52,992.00 and 21,405.15

Step by Step Solution

1. Step 1: Write the proportion equation
   38,399.83 : 52,992.00 = 21,405.15 : x
2. Step 2: Convert to fraction form
   38,399.83/52,992.00 = 21,405.15/x
3. Step 3: Cross multiply
   38,399.83x = 52,992.00 × 21,405.15
4. Step 4: Simplify right side
   38,399.83x = 1,134,301,336.81
5. Step 5: Solve for x
   x = 1,134,301,336.81/38,399.83
6. Step 6: Final answer
   x = 29,539.23