Finding the Fourth Proportional to 12,948.75, 17,867.90 and 7,914.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,948.75 : 17,867.90 = 7,914.20 : x
2. Step 2: Convert to fraction form
   12,948.75/17,867.90 = 7,914.20/x
3. Step 3: Cross multiply
   12,948.75x = 17,867.90 × 7,914.20
4. Step 4: Simplify right side
   12,948.75x = 141,410,005.27
5. Step 5: Solve for x
   x = 141,410,005.27/12,948.75
6. Step 6: Final answer
   x = 10,920.75