Finding the Fourth Proportional to 31,929.56, 47,900.15 and 13,199.43

Step by Step Solution

1. Step 1: Write the proportion equation
   31,929.56 : 47,900.15 = 13,199.43 : x
2. Step 2: Convert to fraction form
   31,929.56/47,900.15 = 13,199.43/x
3. Step 3: Cross multiply
   31,929.56x = 47,900.15 × 13,199.43
4. Step 4: Simplify right side
   31,929.56x = 632,254,371.42
5. Step 5: Solve for x
   x = 632,254,371.42/31,929.56
6. Step 6: Final answer
   x = 19,801.54