Finding the Fourth Proportional to 9,868.06, 13,636.47 and 7,788.70

Step by Step Solution

1. Step 1: Write the proportion equation
   9,868.06 : 13,636.47 = 7,788.70 : x
2. Step 2: Convert to fraction form
   9,868.06/13,636.47 = 7,788.70/x
3. Step 3: Cross multiply
   9,868.06x = 13,636.47 × 7,788.70
4. Step 4: Simplify right side
   9,868.06x = 106,210,373.89
5. Step 5: Solve for x
   x = 106,210,373.89/9,868.06
6. Step 6: Final answer
   x = 10,763.05