Finding the Fourth Proportional to 28,386.50, 39,152.48 and 18,309.89

Step by Step Solution

1. Step 1: Write the proportion equation
   28,386.50 : 39,152.48 = 18,309.89 : x
2. Step 2: Convert to fraction form
   28,386.50/39,152.48 = 18,309.89/x
3. Step 3: Cross multiply
   28,386.50x = 39,152.48 × 18,309.89
4. Step 4: Simplify right side
   28,386.50x = 716,877,314.72
5. Step 5: Solve for x
   x = 716,877,314.72/28,386.50
6. Step 6: Final answer
   x = 25,254.17