Finding the Fourth Proportional to 8,870.47, 12,235.10 and 7,191.94

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.47 : 12,235.10 = 7,191.94 : x
2. Step 2: Convert to fraction form
   8,870.47/12,235.10 = 7,191.94/x
3. Step 3: Cross multiply
   8,870.47x = 12,235.10 × 7,191.94
4. Step 4: Simplify right side
   8,870.47x = 87,994,069.13
5. Step 5: Solve for x
   x = 87,994,069.13/8,870.47
6. Step 6: Final answer
   x = 9,919.89