Finding the Fourth Proportional to 14,158.72, 19,538.48 and 7,870.64

Step by Step Solution

1. Step 1: Write the proportion equation
   14,158.72 : 19,538.48 = 7,870.64 : x
2. Step 2: Convert to fraction form
   14,158.72/19,538.48 = 7,870.64/x
3. Step 3: Cross multiply
   14,158.72x = 19,538.48 × 7,870.64
4. Step 4: Simplify right side
   14,158.72x = 153,780,342.23
5. Step 5: Solve for x
   x = 153,780,342.23/14,158.72
6. Step 6: Final answer
   x = 10,861.18