Finding the Fourth Proportional to 9,381.34, 12,945.68 and 5,131.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,381.34 : 12,945.68 = 5,131.60 : x
2. Step 2: Convert to fraction form
   9,381.34/12,945.68 = 5,131.60/x
3. Step 3: Cross multiply
   9,381.34x = 12,945.68 × 5,131.60
4. Step 4: Simplify right side
   9,381.34x = 66,432,051.49
5. Step 5: Solve for x
   x = 66,432,051.49/9,381.34
6. Step 6: Final answer
   x = 7,081.30