Finding the Fourth Proportional to 20,957.51, 28,916.28 and 13,298.00

Step by Step Solution

1. Step 1: Write the proportion equation
   20,957.51 : 28,916.28 = 13,298.00 : x
2. Step 2: Convert to fraction form
   20,957.51/28,916.28 = 13,298.00/x
3. Step 3: Cross multiply
   20,957.51x = 28,916.28 × 13,298.00
4. Step 4: Simplify right side
   20,957.51x = 384,528,546.86
5. Step 5: Solve for x
   x = 384,528,546.86/20,957.51
6. Step 6: Final answer
   x = 18,348.01