Finding the Fourth Proportional to 13,993.61, 19,311.15 and 7,620.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,993.61 : 19,311.15 = 7,620.10 : x
2. Step 2: Convert to fraction form
   13,993.61/19,311.15 = 7,620.10/x
3. Step 3: Cross multiply
   13,993.61x = 19,311.15 × 7,620.10
4. Step 4: Simplify right side
   13,993.61x = 147,152,894.12
5. Step 5: Solve for x
   x = 147,152,894.12/13,993.61
6. Step 6: Final answer
   x = 10,515.72