Finding the Fourth Proportional to 21,978.46, 30,330.10 and 12,547

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.46 : 30,330.10 = 12,547 : x
2. Step 2: Convert to fraction form
   21,978.46/30,330.10 = 12,547/x
3. Step 3: Cross multiply
   21,978.46x = 30,330.10 × 12,547
4. Step 4: Simplify right side
   21,978.46x = 380,551,764.70
5. Step 5: Solve for x
   x = 380,551,764.70/21,978.46
6. Step 6: Final answer
   x = 17,314.76