Finding the Fourth Proportional to 31,603.57, 47,405.34 and 8,230.01

Step by Step Solution

1. Step 1: Write the proportion equation
   31,603.57 : 47,405.34 = 8,230.01 : x
2. Step 2: Convert to fraction form
   31,603.57/47,405.34 = 8,230.01/x
3. Step 3: Cross multiply
   31,603.57x = 47,405.34 × 8,230.01
4. Step 4: Simplify right side
   31,603.57x = 390,146,185.23
5. Step 5: Solve for x
   x = 390,146,185.23/31,603.57
6. Step 6: Final answer
   x = 12,345.00