Finding the Fourth Proportional to 31,810.42, 47,718.34 and 8,436.58

Step by Step Solution

1. Step 1: Write the proportion equation
   31,810.42 : 47,718.34 = 8,436.58 : x
2. Step 2: Convert to fraction form
   31,810.42/47,718.34 = 8,436.58/x
3. Step 3: Cross multiply
   31,810.42x = 47,718.34 × 8,436.58
4. Step 4: Simplify right side
   31,810.42x = 402,579,592.88
5. Step 5: Solve for x
   x = 402,579,592.88/31,810.42
6. Step 6: Final answer
   x = 12,655.59