Finding the Fourth Proportional to 15,819.40, 21,830.46 and 8,746.12

Step by Step Solution

1. Step 1: Write the proportion equation
   15,819.40 : 21,830.46 = 8,746.12 : x
2. Step 2: Convert to fraction form
   15,819.40/21,830.46 = 8,746.12/x
3. Step 3: Cross multiply
   15,819.40x = 21,830.46 × 8,746.12
4. Step 4: Simplify right side
   15,819.40x = 190,931,822.82
5. Step 5: Solve for x
   x = 190,931,822.82/15,819.40
6. Step 6: Final answer
   x = 12,069.47