Finding the Fourth Proportional to 13,090.68, 18,056.52 and 8,380.80

Step by Step Solution

1. Step 1: Write the proportion equation
   13,090.68 : 18,056.52 = 8,380.80 : x
2. Step 2: Convert to fraction form
   13,090.68/18,056.52 = 8,380.80/x
3. Step 3: Cross multiply
   13,090.68x = 18,056.52 × 8,380.80
4. Step 4: Simplify right side
   13,090.68x = 151,328,082.82
5. Step 5: Solve for x
   x = 151,328,082.82/13,090.68
6. Step 6: Final answer
   x = 11,559.99