Finding the Fourth Proportional to 31,499.31, 47,249.60 and 9,312.67

Step by Step Solution

1. Step 1: Write the proportion equation
   31,499.31 : 47,249.60 = 9,312.67 : x
2. Step 2: Convert to fraction form
   31,499.31/47,249.60 = 9,312.67/x
3. Step 3: Cross multiply
   31,499.31x = 47,249.60 × 9,312.67
4. Step 4: Simplify right side
   31,499.31x = 440,019,944.93
5. Step 5: Solve for x
   x = 440,019,944.93/31,499.31
6. Step 6: Final answer
   x = 13,969.19