Finding the Fourth Proportional to 12,870.18, 17,748.93 and 8,391.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.18 : 17,748.93 = 8,391.69 : x
2. Step 2: Convert to fraction form
   12,870.18/17,748.93 = 8,391.69/x
3. Step 3: Cross multiply
   12,870.18x = 17,748.93 × 8,391.69
4. Step 4: Simplify right side
   12,870.18x = 148,943,518.39
5. Step 5: Solve for x
   x = 148,943,518.39/12,870.18
6. Step 6: Final answer
   x = 11,572.76