Finding the Fourth Proportional to 20,896.84, 28,851.15 and 12,947.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,896.84 : 28,851.15 = 12,947.50 : x
2. Step 2: Convert to fraction form
   20,896.84/28,851.15 = 12,947.50/x
3. Step 3: Cross multiply
   20,896.84x = 28,851.15 × 12,947.50
4. Step 4: Simplify right side
   20,896.84x = 373,550,264.63
5. Step 5: Solve for x
   x = 373,550,264.63/20,896.84
6. Step 6: Final answer
   x = 17,875.92