Finding the Fourth Proportional to 8,670.12, 13,012.47 and 8,123.37

Step by Step Solution

1. Step 1: Write the proportion equation
   8,670.12 : 13,012.47 = 8,123.37 : x
2. Step 2: Convert to fraction form
   8,670.12/13,012.47 = 8,123.37/x
3. Step 3: Cross multiply
   8,670.12x = 13,012.47 × 8,123.37
4. Step 4: Simplify right side
   8,670.12x = 105,705,108.42
5. Step 5: Solve for x
   x = 105,705,108.42/8,670.12
6. Step 6: Final answer
   x = 12,191.89