Finding the Fourth Proportional to 17,978.83, 26,977.34 and 12,123.13

Step by Step Solution

1. Step 1: Write the proportion equation
   17,978.83 : 26,977.34 = 12,123.13 : x
2. Step 2: Convert to fraction form
   17,978.83/26,977.34 = 12,123.13/x
3. Step 3: Cross multiply
   17,978.83x = 26,977.34 × 12,123.13
4. Step 4: Simplify right side
   17,978.83x = 327,049,799.87
5. Step 5: Solve for x
   x = 327,049,799.87/17,978.83
6. Step 6: Final answer
   x = 18,190.83