Finding the Fourth Proportional to 14,870.71, 20,520.70 and 8,155

Step by Step Solution

1. Step 1: Write the proportion equation
   14,870.71 : 20,520.70 = 8,155 : x
2. Step 2: Convert to fraction form
   14,870.71/20,520.70 = 8,155/x
3. Step 3: Cross multiply
   14,870.71x = 20,520.70 × 8,155
4. Step 4: Simplify right side
   14,870.71x = 167,346,308.50
5. Step 5: Solve for x
   x = 167,346,308.50/14,870.71
6. Step 6: Final answer
   x = 11,253.42