Finding the Fourth Proportional to 12,513.84, 18,770.78 and 5,118.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,513.84 : 18,770.78 = 5,118.30 : x
2. Step 2: Convert to fraction form
   12,513.84/18,770.78 = 5,118.30/x
3. Step 3: Cross multiply
   12,513.84x = 18,770.78 × 5,118.30
4. Step 4: Simplify right side
   12,513.84x = 96,074,483.27
5. Step 5: Solve for x
   x = 96,074,483.27/12,513.84
6. Step 6: Final answer
   x = 7,677.46