Finding the Fourth Proportional to 31,810.32, 47,710.62 and 8,438.58

Step by Step Solution

1. Step 1: Write the proportion equation
   31,810.32 : 47,710.62 = 8,438.58 : x
2. Step 2: Convert to fraction form
   31,810.32/47,710.62 = 8,438.58/x
3. Step 3: Cross multiply
   31,810.32x = 47,710.62 × 8,438.58
4. Step 4: Simplify right side
   31,810.32x = 402,609,883.72
5. Step 5: Solve for x
   x = 402,609,883.72/31,810.32
6. Step 6: Final answer
   x = 12,656.58