Finding the Fourth Proportional to 21,888.38, 32,779.93 and 12,499.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,888.38 : 32,779.93 = 12,499.94 : x
2. Step 2: Convert to fraction form
   21,888.38/32,779.93 = 12,499.94/x
3. Step 3: Cross multiply
   21,888.38x = 32,779.93 × 12,499.94
4. Step 4: Simplify right side
   21,888.38x = 409,747,255.78
5. Step 5: Solve for x
   x = 409,747,255.78/21,888.38
6. Step 6: Final answer
   x = 18,719.85