Finding the Fourth Proportional to 14,870.30, 20,521.59 and 8,156.21

Step by Step Solution

1. Step 1: Write the proportion equation
   14,870.30 : 20,521.59 = 8,156.21 : x
2. Step 2: Convert to fraction form
   14,870.30/20,521.59 = 8,156.21/x
3. Step 3: Cross multiply
   14,870.30x = 20,521.59 × 8,156.21
4. Step 4: Simplify right side
   14,870.30x = 167,378,410.40
5. Step 5: Solve for x
   x = 167,378,410.40/14,870.30
6. Step 6: Final answer
   x = 11,255.89