Finding the Fourth Proportional to 9,780.78, 14,602.70 and 8,951.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,780.78 : 14,602.70 = 8,951.34 : x
2. Step 2: Convert to fraction form
   9,780.78/14,602.70 = 8,951.34/x
3. Step 3: Cross multiply
   9,780.78x = 14,602.70 × 8,951.34
4. Step 4: Simplify right side
   9,780.78x = 130,713,687.86
5. Step 5: Solve for x
   x = 130,713,687.86/9,780.78
6. Step 6: Final answer
   x = 13,364.34