Finding the Fourth Proportional to 12,909.51, 19,365.48 and 5,116.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,909.51 : 19,365.48 = 5,116.50 : x
2. Step 2: Convert to fraction form
   12,909.51/19,365.48 = 5,116.50/x
3. Step 3: Cross multiply
   12,909.51x = 19,365.48 × 5,116.50
4. Step 4: Simplify right side
   12,909.51x = 99,083,478.42
5. Step 5: Solve for x
   x = 99,083,478.42/12,909.51
6. Step 6: Final answer
   x = 7,675.23