Finding the Fourth Proportional to 31,980.32, 47,958.96 and 13,513.76

Step by Step Solution

1. Step 1: Write the proportion equation
   31,980.32 : 47,958.96 = 13,513.76 : x
2. Step 2: Convert to fraction form
   31,980.32/47,958.96 = 13,513.76/x
3. Step 3: Cross multiply
   31,980.32x = 47,958.96 × 13,513.76
4. Step 4: Simplify right side
   31,980.32x = 648,105,875.29
5. Step 5: Solve for x
   x = 648,105,875.29/31,980.32
6. Step 6: Final answer
   x = 20,265.77