Finding the Fourth Proportional to 9,015.84, 12,429.32 and 7,770.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,015.84 : 12,429.32 = 7,770.15 : x
2. Step 2: Convert to fraction form
   9,015.84/12,429.32 = 7,770.15/x
3. Step 3: Cross multiply
   9,015.84x = 12,429.32 × 7,770.15
4. Step 4: Simplify right side
   9,015.84x = 96,577,641.95
5. Step 5: Solve for x
   x = 96,577,641.95/9,015.84
6. Step 6: Final answer
   x = 10,712.00