Finding the Fourth Proportional to 7,848.83, 10,830.89 and 7,221.89

Step by Step Solution

1. Step 1: Write the proportion equation
   7,848.83 : 10,830.89 = 7,221.89 : x
2. Step 2: Convert to fraction form
   7,848.83/10,830.89 = 7,221.89/x
3. Step 3: Cross multiply
   7,848.83x = 10,830.89 × 7,221.89
4. Step 4: Simplify right side
   7,848.83x = 78,219,405.92
5. Step 5: Solve for x
   x = 78,219,405.92/7,848.83
6. Step 6: Final answer
   x = 9,965.75