Finding the Fourth Proportional to 23,499.86, 32,431.51 and 13,428.07

Step by Step Solution

1. Step 1: Write the proportion equation
   23,499.86 : 32,431.51 = 13,428.07 : x
2. Step 2: Convert to fraction form
   23,499.86/32,431.51 = 13,428.07/x
3. Step 3: Cross multiply
   23,499.86x = 32,431.51 × 13,428.07
4. Step 4: Simplify right side
   23,499.86x = 435,492,586.49
5. Step 5: Solve for x
   x = 435,492,586.49/23,499.86
6. Step 6: Final answer
   x = 18,531.71