Finding the Fourth Proportional to 14,158.20, 19,538.32 and 7,870.56

Step by Step Solution

1. Step 1: Write the proportion equation
   14,158.20 : 19,538.32 = 7,870.56 : x
2. Step 2: Convert to fraction form
   14,158.20/19,538.32 = 7,870.56/x
3. Step 3: Cross multiply
   14,158.20x = 19,538.32 × 7,870.56
4. Step 4: Simplify right side
   14,158.20x = 153,777,519.86
5. Step 5: Solve for x
   x = 153,777,519.86/14,158.20
6. Step 6: Final answer
   x = 10,861.38