Finding the Fourth Proportional to 23,499.40, 32,430.36 and 12,890.02

Step by Step Solution

1. Step 1: Write the proportion equation
   23,499.40 : 32,430.36 = 12,890.02 : x
2. Step 2: Convert to fraction form
   23,499.40/32,430.36 = 12,890.02/x
3. Step 3: Cross multiply
   23,499.40x = 32,430.36 × 12,890.02
4. Step 4: Simplify right side
   23,499.40x = 418,027,989.01
5. Step 5: Solve for x
   x = 418,027,989.01/23,499.40
6. Step 6: Final answer
   x = 17,788.88