Finding the Fourth Proportional to 31,656.79, 47,473.61 and 13,875.21

Step by Step Solution

1. Step 1: Write the proportion equation
   31,656.79 : 47,473.61 = 13,875.21 : x
2. Step 2: Convert to fraction form
   31,656.79/47,473.61 = 13,875.21/x
3. Step 3: Cross multiply
   31,656.79x = 47,473.61 × 13,875.21
4. Step 4: Simplify right side
   31,656.79x = 658,706,238.83
5. Step 5: Solve for x
   x = 658,706,238.83/31,656.79
6. Step 6: Final answer
   x = 20,807.74