Finding the Fourth Proportional to 9,979.30, 14,931.34 and 5,961.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,979.30 : 14,931.34 = 5,961.80 : x
2. Step 2: Convert to fraction form
   9,979.30/14,931.34 = 5,961.80/x
3. Step 3: Cross multiply
   9,979.30x = 14,931.34 × 5,961.80
4. Step 4: Simplify right side
   9,979.30x = 89,017,685.24
5. Step 5: Solve for x
   x = 89,017,685.24/9,979.30
6. Step 6: Final answer
   x = 8,920.23