Finding the Fourth Proportional to 31,123.96, 46,688.84 and 12,399.46

Step by Step Solution

1. Step 1: Write the proportion equation
   31,123.96 : 46,688.84 = 12,399.46 : x
2. Step 2: Convert to fraction form
   31,123.96/46,688.84 = 12,399.46/x
3. Step 3: Cross multiply
   31,123.96x = 46,688.84 × 12,399.46
4. Step 4: Simplify right side
   31,123.96x = 578,916,404.03
5. Step 5: Solve for x
   x = 578,916,404.03/31,123.96
6. Step 6: Final answer
   x = 18,600.35