Finding the Fourth Proportional to 23,499.05, 32,430.77 and 12,890.75

Step by Step Solution

1. Step 1: Write the proportion equation
   23,499.05 : 32,430.77 = 12,890.75 : x
2. Step 2: Convert to fraction form
   23,499.05/32,430.77 = 12,890.75/x
3. Step 3: Cross multiply
   23,499.05x = 32,430.77 × 12,890.75
4. Step 4: Simplify right side
   23,499.05x = 418,056,948.38
5. Step 5: Solve for x
   x = 418,056,948.38/23,499.05
6. Step 6: Final answer
   x = 17,790.38