Finding the Fourth Proportional to 12,909.42, 19,366.98 and 5,118.03

Step by Step Solution

1. Step 1: Write the proportion equation
   12,909.42 : 19,366.98 = 5,118.03 : x
2. Step 2: Convert to fraction form
   12,909.42/19,366.98 = 5,118.03/x
3. Step 3: Cross multiply
   12,909.42x = 19,366.98 × 5,118.03
4. Step 4: Simplify right side
   12,909.42x = 99,120,784.65
5. Step 5: Solve for x
   x = 99,120,784.65/12,909.42
6. Step 6: Final answer
   x = 7,678.17