Finding the Fourth Proportional to 12,898.15, 17,799.43 and 7,520.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,898.15 : 17,799.43 = 7,520.80 : x
2. Step 2: Convert to fraction form
   12,898.15/17,799.43 = 7,520.80/x
3. Step 3: Cross multiply
   12,898.15x = 17,799.43 × 7,520.80
4. Step 4: Simplify right side
   12,898.15x = 133,865,977.77
5. Step 5: Solve for x
   x = 133,865,977.77/12,898.15
6. Step 6: Final answer
   x = 10,378.70