Finding the Fourth Proportional to 9,781.59, 14,692.67 and 7,909.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,781.59 : 14,692.67 = 7,909.59 : x
2. Step 2: Convert to fraction form
   9,781.59/14,692.67 = 7,909.59/x
3. Step 3: Cross multiply
   9,781.59x = 14,692.67 × 7,909.59
4. Step 4: Simplify right side
   9,781.59x = 116,212,995.71
5. Step 5: Solve for x
   x = 116,212,995.71/9,781.59
6. Step 6: Final answer
   x = 11,880.79