Finding the Fourth Proportional to 31,525.31, 47,256.06 and 20,439.05

Step by Step Solution

1. Step 1: Write the proportion equation
   31,525.31 : 47,256.06 = 20,439.05 : x
2. Step 2: Convert to fraction form
   31,525.31/47,256.06 = 20,439.05/x
3. Step 3: Cross multiply
   31,525.31x = 47,256.06 × 20,439.05
4. Step 4: Simplify right side
   31,525.31x = 965,868,736.86
5. Step 5: Solve for x
   x = 965,868,736.86/31,525.31
6. Step 6: Final answer
   x = 30,637.89